Revert "[CUPS] Fix the browser crash in CUPS settings UI in guest mode."

This reverts commit 194dc32c.

With https://codereview.chromium.org/2610373003/ enabling printing in
incognito, we can reenable printer setup in Guest Mode.

BUG=667395

Review-Url: https://codereview.chromium.org/2616003002
Cr-Commit-Position: refs/heads/master@{#441972}

chrome/browser/chromeos/printing/printer_pref_manager_factory.cc

@@ -21,7 +21,6 @@ base::LazyInstance<PrinterPrefManagerFactory> g_printer_pref_manager =
 // static
 PrinterPrefManager* PrinterPrefManagerFactory::GetForBrowserContext(
     content::BrowserContext* context) {
-  DCHECK(!context->IsOffTheRecord());
   return static_cast<PrinterPrefManager*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }

chrome/browser/ui/webui/options/browser_options_handler.cc

@@ -709,8 +709,7 @@ void BrowserOptionsHandler::GetLocalizedValues(base::DictionaryValue* values) {
 #if defined(OS_CHROMEOS)
   values->SetBoolean("cupsPrintEnabled",
                      base::CommandLine::ForCurrentProcess()->HasSwitch(
-                         ::switches::kEnableNativeCups) &&
-                         !profile->IsOffTheRecord());
+                         ::switches::kEnableNativeCups));
   values->SetString("cupsPrintLearnMoreURL",
                     chrome::kChromeUIMdCupsSettingsURL);
 #endif  // defined(OS_CHROMEOS)

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

@@ -1228,8 +1228,7 @@ void AddPeopleStrings(content::WebUIDataSource* html_source) {
                           ProfileShortcutManager::IsFeatureEnabled());
 }
 
-void AddPrintingStrings(content::WebUIDataSource* html_source,
-                        Profile* profile) {
+void AddPrintingStrings(content::WebUIDataSource* html_source) {
   LocalizedString localized_strings[] = {
     {"printingPageTitle", IDS_SETTINGS_PRINTING},
     {"printingCloudPrintLearnMoreLabel",
@@ -1310,8 +1309,7 @@ void AddPrintingStrings(content::WebUIDataSource* html_source,
 #if defined(OS_CHROMEOS)
   html_source->AddBoolean("showCupsPrintingFeatures",
                           base::CommandLine::ForCurrentProcess()->HasSwitch(
-                              ::switches::kEnableNativeCups) &&
-                              !profile->IsOffTheRecord());
+                              ::switches::kEnableNativeCups));
 #endif
 }
 
@@ -1829,7 +1827,7 @@ void AddLocalizedStrings(content::WebUIDataSource* html_source,
   AddOnStartupStrings(html_source);
   AddPasswordsAndFormsStrings(html_source);
   AddPeopleStrings(html_source);
-  AddPrintingStrings(html_source, profile);
+  AddPrintingStrings(html_source);
   AddPrivacyStrings(html_source, profile);
   AddResetStrings(html_source);
   AddSearchEnginesStrings(html_source);