In-app messaging to communicate the imminent 32-bit deprecation to 32-bit-only

users.

In Google Chrome-branded builds, show an infobar at startup to users with
32-bit-only systems, and add a message to the about page for those users
advising that automatic updates will soon stop because the system
configuration is about to become unsupported.

A provision is made to change this message to an "end-of-the-line" message for
the final 32-bit-compatible build. When this switch is flipped, the autoupdate
status and promotion button on the about page will be hidden. The
"end-of-the-line" message will appear there, alongside the icon normally used
for failed updates. The startup infobar text will change at that point as
well.

No observable changes for non-branded Chromium builds (since they're not
receiving updates through this mechanism) or for users with 64-bit-capable
systems (because they're not being obsoleted).

R=arv@chromium.org, thakis@chromium.org, thakis
BUG=303280,331810,331830

Review URL: https://codereview.chromium.org/125443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245598 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/chromium_strings.grd

@@ -329,6 +329,15 @@ name="DOMAIN">$1<ex>paypal.com</ex></ph>&lt;/strong&gt;, but the server presente
       <message name="IDS_ABOUT_TERMS_OF_SERVICE" desc="The terms of service label in the About box.">
         Not used in Chromium. Placeholder to keep resource maps in sync. It expects one argument: $1.
       </message>
+      <if expr="is_macosx">
+        <!-- Mac 32-bit deprecation -->
+        <message name="IDS_MAC_32_BIT_OBSOLETE_SOON" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is about to become unsupported.">
+          This computer will soon stop receiving Chromium updates because its hardware is no longer supported.
+        </message>
+        <message name="IDS_MAC_32_BIT_OBSOLETE_NOW" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is no longer supported.">
+          This computer will no longer receive Chromium updates because its hardware is no longer supported.
+        </message>
+      </if>
       <message name="IDS_ACCNAME_APP" desc="The accessible name for the app menu.">
         Chromium
       </message>

chrome/app/google_chrome_strings.grd

@@ -252,6 +252,15 @@ name="DOMAIN">$1<ex>paypal.com</ex></ph>&lt;/strong&gt;, but the server presente
       <message name="IDS_ABOUT_TERMS_OF_SERVICE" desc="The terms of service label in the About box.">
         Google Chrome <ph name="TERMS_OF_SERVICE_LINK">&lt;a target="_blank" href="$1"&gt;</ph>Terms of Service<ph name="END_TERMS_OF_SERVICE_LINK">&lt;/a&gt;</ph>
       </message>
+      <if expr="is_macosx">
+        <!-- Mac 32-bit deprecation -->
+        <message name="IDS_MAC_32_BIT_OBSOLETE_SOON" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is about to become unsupported.">
+          This computer will soon stop receiving Google Chrome updates because its hardware is no longer supported.
+        </message>
+        <message name="IDS_MAC_32_BIT_OBSOLETE_NOW" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is no longer supported.">
+          This computer will no longer receive Google Chrome updates because its hardware is no longer supported.
+        </message>
+      </if>
       <message name="IDS_ACCNAME_APP" desc="The accessible name for the app menu.">
         Chrome
       </message>

chrome/browser/mac/keystone_glue.mm

@@ -7,8 +7,6 @@
 #include <sys/mount.h>
 #include <sys/param.h>
 #include <sys/stat.h>
-#include <sys/sysctl.h>
-#include <sys/types.h>
 
 #include <vector>
 
@@ -26,6 +24,7 @@
 #include "base/threading/worker_pool.h"
 #include "build/build_config.h"
 #import "chrome/browser/mac/keystone_registration.h"
+#include "chrome/browser/mac/obsolete_system.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_version_info.h"
 #include "grit/chromium_strings.h"
@@ -191,9 +190,6 @@ class PerformBridge : public base::RefCountedThreadSafe<PerformBridge> {
 // Returns the brand file path to use for Keystone.
 - (NSString*)brandFilePath;
 
-// YES if the system's CPU is 32-bit-only, NO if it's 64-bit-capable.
-- (BOOL)has32BitOnlyCPU;
-
 // YES if no update installation has succeeded since a binary diff patch
 // installation failed. This signals the need to attempt a full installer
 // which does not depend on applying a patch to existing files.
@@ -1013,19 +1009,6 @@ NSString* const kVersionKey = @"KSVersion";
   }
 }
 
-- (BOOL)has32BitOnlyCPU {
-#if defined(ARCH_CPU_64_BITS)
-  return NO;
-#else  // ARCH_CPU_64_BITS
-  int value;
-  size_t valueSize = sizeof(value);
-  if (sysctlbyname("hw.cpu64bit_capable", &value, &valueSize, NULL, 0) != 0) {
-    return YES;
-  }
-  return value == 0;
-#endif  // ARCH_CPU_64_BITS
-}
-
 - (BOOL)wantsFullInstaller {
   // It's difficult to check the tag prior to Keystone registration, and
   // performing registration replaces the tag. keystone_install.sh
@@ -1057,7 +1040,7 @@ NSString* const kVersionKey = @"KSVersion";
   // Info.plist, tag suffix components should only be appended to the tag
   // suffix in ASCII sort order.
   NSString* tagSuffix = @"";
-  if ([self has32BitOnlyCPU]) {
+  if (ObsoleteSystemMac::Has32BitOnlyCPU()) {
     tagSuffix = [tagSuffix stringByAppendingString:@"-32bit"];
   }
   if ([self wantsFullInstaller]) {

chrome/browser/mac/obsolete_system.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/mac/obsolete_system.h"
+
+#include <sys/sysctl.h>
+#include <sys/types.h>
+
+#include "grit/chromium_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+
+#if !defined(ARCH_CPU_64_BITS)
+
+// static
+bool ObsoleteSystemMac::Has32BitOnlyCPU() {
+  int value;
+  size_t valueSize = sizeof(value);
+  if (sysctlbyname("hw.cpu64bit_capable", &value, &valueSize, NULL, 0) != 0) {
+    return true;
+  }
+  return value == 0;
+}
+
+// static
+base::string16 ObsoleteSystemMac::LocalizedObsoleteSystemString() {
+  return l10n_util::GetStringUTF16(
+      Is32BitEndOfTheLine() ? IDS_MAC_32_BIT_OBSOLETE_NOW :
+                              IDS_MAC_32_BIT_OBSOLETE_SOON);
+}
+
+#endif

chrome/browser/mac/obsolete_system.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_MAC_OBSOLETE_SYSTEM_H_
+#define CHROME_BROWSER_MAC_OBSOLETE_SYSTEM_H_
+
+#include "base/basictypes.h"
+#include "base/strings/string16.h"
+
+class ObsoleteSystemMac {
+ public:
+  // true if 32-bit-only systems are already considered obsolete, or if
+  // they'll be considered obsolete soon. Used to control whether to show
+  // messaging about 32-bit deprecation within the app.
+  static bool Is32BitObsoleteNowOrSoon() {
+#if defined(GOOGLE_CHROME_BUILD)
+    return true;
+#else
+    return false;
+#endif
+  }
+
+  // true if the system's CPU is 32-bit-only, false if it's 64-bit-capable.
+#if !defined(ARCH_CPU_64_BITS)
+  static bool Has32BitOnlyCPU();
+#else
+  static bool Has32BitOnlyCPU() {
+    return false;
+  }
+#endif
+
+  // Returns a localized string informing users that their system will either
+  // soon be unsupported by future versions of the application, or that they
+  // are already using the last version of the application that supports their
+  // system. Do not use the returned string unless both
+  // Is32BitObsoleteNowOrSoon() and Has32BitOnlyCPU() return true.
+#if !defined(ARCH_CPU_64_BITS)
+  static base::string16 LocalizedObsoleteSystemString();
+#else
+  static base::string16 LocalizedObsoleteSystemString() {
+    return base::string16();
+  }
+#endif
+
+  // true if this is the final release that will run on 32-bit-only systems.
+  static bool Is32BitEndOfTheLine() {
+    // TODO(mark): Change to true immediately prior to the final build that
+    // supports 32-bit-only systems.
+    return false;
+  }
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ObsoleteSystemMac);
+};
+
+#endif  // CHROME_BROWSER_MAC_OBSOLETE_SYSTEM_H_

chrome/browser/resources/help/help.html

@@ -67,6 +67,14 @@
         <div id="update-status-message-container">
           <div id="update-status-message" i18n-content="updateCheckStarted">
           </div>
+<if expr="is_macosx">
+          <div id="update-obsolete-system-container" hidden>
+            <span id="update-obsolete-system" 
+                i18n-content="updateObsoleteSystem"></span>
+            <a i18n-values="href:updateObsoleteSystemURL"
+                i18n-content="learnMore" target="_blank"></a>
+          </div>
+</if>
           <div id="allowed-connection-types-message" hidden></div>
         </div>
       </div>

chrome/browser/resources/help/help.js

@@ -246,6 +246,15 @@ cr.define('help', function() {
      * @private
      */
     setUpdateStatus_: function(status, message) {
+      if (cr.isMac &&
+          $('update-status-message') &&
+          $('update-status-message').hidden) {
+        // Chrome has reached the end of the line on this system. The
+        // update-obsolete-system message is displayed. No other auto-update
+        // status should be displayed.
+        return;
+      }
+
       var channel = this.targetChannel_;
       if (status == 'checking') {
         this.setUpdateImage_('working');
@@ -338,6 +347,30 @@ cr.define('help', function() {
       }
     },
 
+    /**
+     * @private
+     */
+    setObsoleteSystem_: function(obsolete) {
+      if (cr.isMac && $('update-obsolete-system-container')) {
+        $('update-obsolete-system-container').hidden = !obsolete;
+      }
+    },
+
+    /**
+     * @private
+     */
+    setObsoleteSystemEndOfTheLine_: function(endOfTheLine) {
+      if (cr.isMac &&
+          $('update-obsolete-system-container') &&
+          !$('update-obsolete-system-container').hidden &&
+          $('update-status-message')) {
+        $('update-status-message').hidden = endOfTheLine;
+        if (endOfTheLine) {
+          this.setUpdateImage_('failed');
+        }
+      }
+    },
+
     /**
      * @private
      */
@@ -461,8 +494,12 @@ cr.define('help', function() {
     HelpPage.getInstance().setPromotionState_(state);
   };
 
-  HelpPage.setObsoleteOS = function(obsolete) {
-    HelpPage.getInstance().setObsoleteOS_(obsolete);
+  HelpPage.setObsoleteSystem = function(obsolete) {
+    HelpPage.getInstance().setObsoleteSystem_(obsolete);
+  };
+
+  HelpPage.setObsoleteSystemEndOfTheLine = function(endOfTheLine) {
+    HelpPage.getInstance().setObsoleteSystemEndOfTheLine_(endOfTheLine);
   };
 
   HelpPage.setOSVersion = function(version) {

chrome/browser/ui/startup/obsolete_os_infobar_delegate.cc → chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc

@@ -2,23 +2,32 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/startup/obsolete_os_infobar_delegate.h"
+#include "chrome/browser/ui/startup/obsolete_system_infobar_delegate.h"
 
 #include "chrome/browser/infobars/infobar.h"
 #include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/common/url_constants.h"
 #include "content/public/browser/web_contents.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if defined(OS_MACOSX)
+#include "chrome/browser/mac/obsolete_system.h"
+#endif
+
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
-
 // static
-void ObsoleteOSInfoBarDelegate::Create(InfoBarService* infobar_service) {
-#if defined(TOOLKIT_GTK)
+void ObsoleteSystemInfoBarDelegate::Create(InfoBarService* infobar_service) {
+#if defined(OS_MACOSX)
+  if (!ObsoleteSystemMac::Is32BitObsoleteNowOrSoon() ||
+      !ObsoleteSystemMac::Has32BitOnlyCPU()) {
+    return;
+  }
+#elif defined(TOOLKIT_GTK)
   // We've deprecated support for Ubuntu Lucid.  Rather than attempting to
   // determine whether you're using that, we instead key off the GTK version;
   // this will also deprecate other distributions (including variants of Ubuntu)
@@ -37,31 +46,40 @@ void ObsoleteOSInfoBarDelegate::Create(InfoBarService* infobar_service) {
 #endif
 
   infobar_service->AddInfoBar(ConfirmInfoBarDelegate::CreateInfoBar(
-      scoped_ptr<ConfirmInfoBarDelegate>(new ObsoleteOSInfoBarDelegate())));
+      scoped_ptr<ConfirmInfoBarDelegate>(new ObsoleteSystemInfoBarDelegate())));
 }
 
-ObsoleteOSInfoBarDelegate::ObsoleteOSInfoBarDelegate()
+ObsoleteSystemInfoBarDelegate::ObsoleteSystemInfoBarDelegate()
     : ConfirmInfoBarDelegate() {
 }
 
-ObsoleteOSInfoBarDelegate::~ObsoleteOSInfoBarDelegate() {
+ObsoleteSystemInfoBarDelegate::~ObsoleteSystemInfoBarDelegate() {
 }
 
-base::string16 ObsoleteOSInfoBarDelegate::GetMessageText() const {
+base::string16 ObsoleteSystemInfoBarDelegate::GetMessageText() const {
+#if defined(OS_MACOSX)
+  return ObsoleteSystemMac::LocalizedObsoleteSystemString();
+#else
   return l10n_util::GetStringUTF16(IDS_SYSTEM_OBSOLETE_MESSAGE);
+#endif
 }
 
-int ObsoleteOSInfoBarDelegate::GetButtons() const {
+int ObsoleteSystemInfoBarDelegate::GetButtons() const {
   return BUTTON_NONE;
 }
 
-base::string16 ObsoleteOSInfoBarDelegate::GetLinkText() const {
+base::string16 ObsoleteSystemInfoBarDelegate::GetLinkText() const {
   return l10n_util::GetStringUTF16(IDS_LEARN_MORE);
 }
 
-bool ObsoleteOSInfoBarDelegate::LinkClicked(WindowOpenDisposition disposition) {
+bool ObsoleteSystemInfoBarDelegate::LinkClicked(
+    WindowOpenDisposition disposition) {
   web_contents()->OpenURL(content::OpenURLParams(
+#if defined(OS_MACOSX)
+      GURL(chrome::kMac32BitDeprecationURL),
+#else
       GURL("http://www.google.com/support/chrome/bin/answer.py?answer=95411"),
+#endif
       content::Referrer(),
       (disposition == CURRENT_TAB) ? NEW_FOREGROUND_TAB : disposition,
       content::PAGE_TRANSITION_LINK, false));

chrome/browser/ui/startup/obsolete_os_infobar_delegate.h → chrome/browser/ui/startup/obsolete_system_infobar_delegate.h

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_UI_STARTUP_OBSOLETE_OS_INFOBAR_DELEGATE_H_
-#define CHROME_BROWSER_UI_STARTUP_OBSOLETE_OS_INFOBAR_DELEGATE_H_
+#ifndef CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
@@ -12,24 +12,24 @@
 
 class InfoBarService;
 
-// An infobar that displays a message saying the system is obsolete, along with
-// a "Learn More" link.
-class ObsoleteOSInfoBarDelegate : public ConfirmInfoBarDelegate {
+// An infobar that displays a message saying the system (OS or hardware) is
+// obsolete, along with a "Learn More" link.
+class ObsoleteSystemInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
-  // Creates an obsolete OS infobar and delegate and adds the infobar to
+  // Creates an obsolete system infobar and delegate and adds the infobar to
   // |infobar_service|.
   static void Create(InfoBarService* infobar_service);
 
  private:
-  ObsoleteOSInfoBarDelegate();
-  virtual ~ObsoleteOSInfoBarDelegate();
+  ObsoleteSystemInfoBarDelegate();
+  virtual ~ObsoleteSystemInfoBarDelegate();
 
   virtual base::string16 GetMessageText() const OVERRIDE;
   virtual int GetButtons() const OVERRIDE;
   virtual base::string16 GetLinkText() const OVERRIDE;
   virtual bool LinkClicked(WindowOpenDisposition disposition) OVERRIDE;
 
-  DISALLOW_COPY_AND_ASSIGN(ObsoleteOSInfoBarDelegate);
+  DISALLOW_COPY_AND_ASSIGN(ObsoleteSystemInfoBarDelegate);
 };
 
-#endif  // CHROME_BROWSER_UI_STARTUP_OBSOLETE_OS_INFOBAR_DELEGATE_H_
+#endif  // CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_

chrome/browser/ui/startup/startup_browser_creator_impl.cc

@@ -65,7 +65,7 @@
 #include "chrome/browser/ui/startup/bad_flags_prompt.h"
 #include "chrome/browser/ui/startup/default_browser_prompt.h"
 #include "chrome/browser/ui/startup/google_api_keys_infobar_delegate.h"
-#include "chrome/browser/ui/startup/obsolete_os_infobar_delegate.h"
+#include "chrome/browser/ui/startup/obsolete_system_infobar_delegate.h"
 #include "chrome/browser/ui/startup/session_crashed_infobar_delegate.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "chrome/browser/ui/tabs/pinned_tab_codec.h"
@@ -905,7 +905,7 @@ void StartupBrowserCreatorImpl::AddInfoBarsIfNecessary(
     chrome::ShowBadFlagsPrompt(browser);
     GoogleApiKeysInfoBarDelegate::Create(InfoBarService::FromWebContents(
         browser->tab_strip_model()->GetActiveWebContents()));
-    ObsoleteOSInfoBarDelegate::Create(InfoBarService::FromWebContents(
+    ObsoleteSystemInfoBarDelegate::Create(InfoBarService::FromWebContents(
         browser->tab_strip_model()->GetActiveWebContents()));
 
 #if !defined(OS_CHROMEOS)

chrome/browser/ui/webui/help/help_handler.cc

@@ -38,6 +38,10 @@
 #include "v8/include/v8.h"
 #include "webkit/common/user_agent/user_agent_util.h"
 
+#if defined(OS_MACOSX)
+#include "chrome/browser/mac/obsolete_system.h"
+#endif
+
 #if defined(OS_CHROMEOS)
 #include "base/files/file_util_proxy.h"
 #include "base/i18n/time_formatting.h"
@@ -215,6 +219,13 @@ void HelpHandler::GetLocalizedValues(content::WebUIDataSource* source) {
                       l10n_util::GetStringUTF16(resources[i].ids));
   }
 
+#if defined(OS_MACOSX)
+  source->AddString("updateObsoleteSystem",
+                    ObsoleteSystemMac::LocalizedObsoleteSystemString());
+  source->AddString("updateObsoleteSystemURL",
+                    chrome::kMac32BitDeprecationURL);
+#endif
+
   source->AddString(
       "browserVersion",
       l10n_util::GetStringFUTF16(IDS_ABOUT_PRODUCT_VERSION,
@@ -344,6 +355,17 @@ void HelpHandler::OnPageLoaded(const base::ListValue* args) {
 #endif
       );
 
+#if defined(OS_MACOSX)
+  web_ui()->CallJavascriptFunction(
+      "help.HelpPage.setObsoleteSystem",
+      base::FundamentalValue(ObsoleteSystemMac::Is32BitObsoleteNowOrSoon() &&
+                             ObsoleteSystemMac::Has32BitOnlyCPU()));
+  web_ui()->CallJavascriptFunction(
+      "help.HelpPage.setObsoleteSystemEndOfTheLine",
+      base::FundamentalValue(ObsoleteSystemMac::Is32BitObsoleteNowOrSoon() &&
+                             ObsoleteSystemMac::Is32BitEndOfTheLine()));
+#endif
+
 #if defined(OS_CHROMEOS)
   web_ui()->CallJavascriptFunction(
       "help.HelpPage.updateIsEnterpriseManaged",

chrome/browser/ui/webui/help/version_updater_mac.mm

@@ -8,6 +8,7 @@
 #include "base/bind_helpers.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #import "chrome/browser/mac/keystone_glue.h"
+#include "chrome/browser/mac/obsolete_system.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -223,6 +224,13 @@ void VersionUpdaterMac::UpdateStatus(NSDictionary* dictionary) {
 }
 
 void VersionUpdaterMac::UpdateShowPromoteButton() {
+  if (ObsoleteSystemMac::Has32BitOnlyCPU() &&
+      ObsoleteSystemMac::Is32BitEndOfTheLine()) {
+    // Promotion is moot upon reaching the end of the line.
+    show_promote_button_ = false;
+    return;
+  }
+
   KeystoneGlue* keystone_glue = [KeystoneGlue defaultKeystoneGlue];
   AutoupdateStatus recent_status = [keystone_glue recentStatus];
   if (recent_status == kAutoupdateRegistering ||

chrome/chrome_browser.gypi

@@ -1008,6 +1008,8 @@
         'browser/mac/keystone_registration.mm',
         'browser/mac/master_prefs.h',
         'browser/mac/master_prefs.mm',
+        'browser/mac/obsolete_system.cc',
+        'browser/mac/obsolete_system.h',
         'browser/mac/relauncher.cc',
         'browser/mac/relauncher.h',
         'browser/mac/security_wrappers.cc',

chrome/chrome_browser_ui.gypi

@@ -1567,8 +1567,8 @@
         'browser/ui/startup/default_browser_prompt_win.cc',
         'browser/ui/startup/google_api_keys_infobar_delegate.cc',
         'browser/ui/startup/google_api_keys_infobar_delegate.h',
-        'browser/ui/startup/obsolete_os_infobar_delegate.cc',
-        'browser/ui/startup/obsolete_os_infobar_delegate.h',
+        'browser/ui/startup/obsolete_system_infobar_delegate.cc',
+        'browser/ui/startup/obsolete_system_infobar_delegate.h',
         'browser/ui/startup/session_crashed_infobar_delegate.cc',
         'browser/ui/startup/session_crashed_infobar_delegate.h',
         'browser/ui/startup/startup_browser_creator.cc',

chrome/common/url_constants.cc

@@ -671,4 +671,13 @@ const char kLanguageSettingsLearnMoreUrl[] =
     "https://support.google.com/chrome/topic/1678461";
 #endif
 
+#if defined(OS_MACOSX)
+const char kMac32BitDeprecationURL[] =
+#if !defined(ARCH_CPU_64_BITS)
+    "https://support.google.com/chrome/?p=ui_mac_32bit_support";
+#else
+    "";
+#endif
+#endif
+
 }  // namespace chrome

chrome/common/url_constants.h

@@ -506,6 +506,11 @@ extern const char kMediaAccessLearnMoreUrl[];
 // The URL for the "Learn more" link in the language settings.
 extern const char kLanguageSettingsLearnMoreUrl[];
 
+#if defined(OS_MACOSX)
+// The URL for the 32-bit Mac deprecation help center article
+extern const char kMac32BitDeprecationURL[];
+#endif
+
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_URL_CONSTANTS_H_