Flash: Delete PluginsFieldTrial abstraction.

Now that kPreferHtmlOverPlugins feature has launched, enabled by
default, and now removed from the code as a flag, we can delete this
abstraction.

This folds the mapping of ASK => DETECT logic into PluginUtils
directly and cleans up the callsites.

This CL should not change Chrome's behavior in any way.

Bug: 945035
Change-Id: I4298aed3b4c5f95e4323cb658c9d42ead6c31cfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542496Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645354}

chrome/browser/BUILD.gn

@@ -4571,8 +4571,6 @@ jumbo_split_static_library("browser") {
       "plugins/plugin_status_pref_setter.h",
       "plugins/plugin_utils.cc",
       "plugins/plugin_utils.h",
-      "plugins/plugins_field_trial.cc",
-      "plugins/plugins_field_trial.h",
       "plugins/plugins_resource_service.cc",
       "plugins/plugins_resource_service.h",
       "plugins/reload_plugin_infobar_delegate.cc",

chrome/browser/plugins/chrome_plugin_service_filter.cc

@@ -14,7 +14,6 @@
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "chrome/browser/plugins/plugin_utils.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/render_messages.h"
@@ -210,8 +209,6 @@ bool ChromePluginServiceFilter::IsPluginAvailable(
         context_info_it->second->host_content_settings_map.get();
     ContentSetting flash_setting = PluginUtils::GetFlashPluginContentSetting(
         settings_map, main_frame_origin, plugin_content_url, &is_managed);
-    flash_setting = PluginsFieldTrial::EffectiveContentSetting(
-        settings_map, CONTENT_SETTINGS_TYPE_PLUGINS, flash_setting);
 
     if (flash_setting == CONTENT_SETTING_ALLOW)
       return true;

chrome/browser/plugins/chrome_plugin_service_filter_unittest.cc

@@ -20,7 +20,6 @@
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"

chrome/browser/plugins/flash_download_interception.cc

@@ -11,7 +11,6 @@
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/permissions/permission_manager.h"
 #include "chrome/browser/plugins/plugin_utils.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_features.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ -78,8 +77,6 @@ void FlashDownloadInterception::InterceptFlashDownloadNavigation(
   ContentSetting flash_setting = PluginUtils::GetFlashPluginContentSetting(
       host_content_settings_map, url::Origin::Create(source_url), source_url,
       nullptr);
-  flash_setting = PluginsFieldTrial::EffectiveContentSetting(
-      host_content_settings_map, CONTENT_SETTINGS_TYPE_PLUGINS, flash_setting);
 
   if (flash_setting == CONTENT_SETTING_DETECT_IMPORTANT_CONTENT) {
     PermissionManager* manager = PermissionManager::Get(profile);
@@ -133,9 +130,6 @@ bool FlashDownloadInterception::ShouldStopFlashDownloadAction(
     ContentSetting flash_setting = PluginUtils::GetFlashPluginContentSetting(
         host_content_settings_map, url::Origin::Create(source_url), source_url,
         nullptr);
-    flash_setting = PluginsFieldTrial::EffectiveContentSetting(
-        host_content_settings_map, CONTENT_SETTINGS_TYPE_PLUGINS,
-        flash_setting);
 
     return flash_setting == CONTENT_SETTING_DETECT_IMPORTANT_CONTENT ||
            flash_setting == CONTENT_SETTING_BLOCK;

chrome/browser/plugins/flash_permission_context.cc

@@ -8,7 +8,6 @@
 #include "chrome/browser/permissions/permission_request_id.h"
 #include "chrome/browser/plugins/flash_temporary_permission_tracker.h"
 #include "chrome/browser/plugins/plugin_utils.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/site_settings_helper.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
@@ -47,8 +46,6 @@ ContentSetting FlashPermissionContext::GetPermissionStatusInternal(
   ContentSetting flash_setting = PluginUtils::GetFlashPluginContentSetting(
       host_content_settings_map, url::Origin::Create(embedding_origin),
       requesting_origin, nullptr);
-  flash_setting = PluginsFieldTrial::EffectiveContentSetting(
-      host_content_settings_map, content_settings_type(), flash_setting);
   if (flash_setting == CONTENT_SETTING_DETECT_IMPORTANT_CONTENT)
     return CONTENT_SETTING_ASK;
   return flash_setting;

chrome/browser/plugins/plugin_info_host_impl.cc

@@ -25,7 +25,6 @@
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "chrome/browser/plugins/plugin_utils.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_otr_state.h"
 #include "chrome/common/buildflags.h"
@@ -274,20 +273,13 @@ void PluginInfoHostImpl::Context::DecidePluginStatus(
       plugin_identifier, &plugin_setting, &uses_default_content_setting,
       &is_managed);
 
-  // TODO(tommycli): Remove once we deprecate the plugin ASK policy.
-  bool legacy_ask_user = plugin_setting == CONTENT_SETTING_ASK;
-  plugin_setting = PluginsFieldTrial::EffectiveContentSetting(
-      host_content_settings_map_, CONTENT_SETTINGS_TYPE_PLUGINS,
-      plugin_setting);
-
   DCHECK(plugin_setting != CONTENT_SETTING_DEFAULT);
   DCHECK(plugin_setting != CONTENT_SETTING_ASK);
 
   if (*status == chrome::mojom::PluginStatus::kFlashHiddenPreferHtml) {
     if (plugin_setting == CONTENT_SETTING_BLOCK) {
-      *status = is_managed && !legacy_ask_user
-                    ? chrome::mojom::PluginStatus::kBlockedByPolicy
-                    : chrome::mojom::PluginStatus::kBlockedNoLoading;
+      *status = is_managed ? chrome::mojom::PluginStatus::kBlockedByPolicy
+                           : chrome::mojom::PluginStatus::kBlockedNoLoading;
     }
     return;
   }
@@ -329,11 +321,8 @@ void PluginInfoHostImpl::Context::DecidePluginStatus(
        !run_all_flash_in_allow_mode_.GetValue())) {
     *status = chrome::mojom::PluginStatus::kPlayImportantContent;
   } else if (plugin_setting == CONTENT_SETTING_BLOCK) {
-    // For managed users with the ASK policy, we allow manually running plugins
-    // via context menu. This is the closest to admin intent.
-    *status = is_managed && !legacy_ask_user
-                  ? chrome::mojom::PluginStatus::kBlockedByPolicy
-                  : chrome::mojom::PluginStatus::kBlocked;
+    *status = is_managed ? chrome::mojom::PluginStatus::kBlockedByPolicy
+                         : chrome::mojom::PluginStatus::kBlocked;
   }
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)

chrome/browser/plugins/plugin_utils.cc

@@ -93,6 +93,11 @@ void GetPluginContentSettingInternal(
       *setting = CONTENT_SETTING_BLOCK;
     }
   }
+
+  // For Plugins, ASK is obsolete. Show as DETECT_IMPORTANT_CONTENT to reflect
+  // actual behavior.
+  if (*setting == ContentSetting::CONTENT_SETTING_ASK)
+    *setting = ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT;
 }
 
 }  // namespace

chrome/browser/plugins/plugins_field_trial.cc

-// Copyright 2015 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/plugins/plugins_field_trial.h"
-
-#include <string>
-
-#include "base/feature_list.h"
-#include "base/strings/string_number_conversions.h"
-#include "chrome/browser/plugins/plugin_utils.h"
-
-// static
-ContentSetting PluginsFieldTrial::EffectiveContentSetting(
-    const HostContentSettingsMap* host_content_settings_map,
-    ContentSettingsType type,
-    ContentSetting setting) {
-  if (type != CONTENT_SETTINGS_TYPE_PLUGINS ||
-      setting != ContentSetting::CONTENT_SETTING_ASK) {
-    return setting;
-  }
-
-  // For Plugins, ASK is obsolete. Show as DETECT_IMPORTANT_CONTENT to reflect
-  // actual behavior.
-  return ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT;
-}

chrome/browser/plugins/plugins_field_trial.h

-// Copyright 2015 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_PLUGINS_PLUGINS_FIELD_TRIAL_H_
-#define CHROME_BROWSER_PLUGINS_PLUGINS_FIELD_TRIAL_H_
-
-#include "base/macros.h"
-#include "components/content_settings/core/common/content_settings.h"
-#include "components/content_settings/core/common/content_settings_types.h"
-
-class HostContentSettingsMap;
-
-// This class manages the Plugins field trials.
-class PluginsFieldTrial {
- public:
-  // Returns the effective content setting for plugins. Passes non-plugin
-  // content settings through without modification.
-  // TODO(tommycli): Eliminate this method and fold the logic into
-  // HostContentSettingsMap.
-  static ContentSetting EffectiveContentSetting(
-      const HostContentSettingsMap* host_content_settings_map,
-      ContentSettingsType type,
-      ContentSetting setting);
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(PluginsFieldTrial);
-};
-
-#endif  // CHROME_BROWSER_PLUGINS_PLUGINS_FIELD_TRIAL_H_

chrome/browser/ui/page_info/page_info_ui.cc

@@ -13,7 +13,6 @@
 #include "chrome/browser/permissions/permission_manager.h"
 #include "chrome/browser/permissions/permission_result.h"
 #include "chrome/browser/permissions/permission_util.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/grit/generated_resources.h"
@@ -187,18 +186,11 @@ ContentSetting GetEffectiveSetting(Profile* profile,
   if (effective_setting == CONTENT_SETTING_DEFAULT)
     effective_setting = default_setting;
 
-#if BUILDFLAG(ENABLE_PLUGINS)
-  HostContentSettingsMap* host_content_settings_map =
-      HostContentSettingsMapFactory::GetForProfile(profile);
-  effective_setting = PluginsFieldTrial::EffectiveContentSetting(
-      host_content_settings_map, type, effective_setting);
-
   // Display the UI string for ASK instead of DETECT for Flash.
   // TODO(tommycli): Just migrate the actual content setting to ASK.
   if (effective_setting == CONTENT_SETTING_DETECT_IMPORTANT_CONTENT)
     effective_setting = CONTENT_SETTING_ASK;
 
-#endif
   return effective_setting;
 }
 

chrome/browser/ui/page_info/permission_menu_model.cc

@@ -5,7 +5,6 @@
 #include "chrome/browser/ui/page_info/permission_menu_model.h"
 
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
-#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/common/chrome_features.h"
 #include "components/strings/grit/components_strings.h"
 #include "content/public/common/origin_util.h"
@@ -24,22 +23,14 @@ PermissionMenuModel::PermissionMenuModel(Profile* profile,
   DCHECK(!callback_.is_null());
   base::string16 label;
 
-  // Retrieve the string to show for the default setting for this permission.
-  ContentSetting effective_default_setting = permission_.default_setting;
-  DCHECK_NE(effective_default_setting, CONTENT_SETTING_NUM_SETTINGS);
-
-#if BUILDFLAG(ENABLE_PLUGINS)
-  effective_default_setting = PluginsFieldTrial::EffectiveContentSetting(
-      host_content_settings_map_, permission_.type,
-      permission_.default_setting);
-#endif  // BUILDFLAG(ENABLE_PLUGINS)
+  DCHECK_NE(permission_.default_setting, CONTENT_SETTING_NUM_SETTINGS);
 
   // The Material UI for site settings uses comboboxes instead of menubuttons,
   // which means the elements of the menu themselves have to be shorter, instead
   // of simply setting a shorter label on the menubutton.
   label = PageInfoUI::PermissionActionToUIString(
       profile, permission_.type, CONTENT_SETTING_DEFAULT,
-      effective_default_setting, permission_.source);
+      permission_.default_setting, permission_.source);
 
   AddCheckItem(CONTENT_SETTING_DEFAULT, label);
 
@@ -47,13 +38,13 @@ PermissionMenuModel::PermissionMenuModel(Profile* profile,
   if (ShouldShowAllow(url)) {
     label = PageInfoUI::PermissionActionToUIString(
         profile, permission_.type, CONTENT_SETTING_ALLOW,
-        effective_default_setting, permission_.source);
+        permission_.default_setting, permission_.source);
     AddCheckItem(CONTENT_SETTING_ALLOW, label);
   }
 
   // Retrieve the string to show for blocking the permission.
   label = PageInfoUI::PermissionActionToUIString(
-      profile, info.type, CONTENT_SETTING_BLOCK, effective_default_setting,
+      profile, info.type, CONTENT_SETTING_BLOCK, permission_.default_setting,
       info.source);
   AddCheckItem(CONTENT_SETTING_BLOCK, label);
 
@@ -61,7 +52,7 @@ PermissionMenuModel::PermissionMenuModel(Profile* profile,
   // permission.
   if (ShouldShowAsk(url)) {
     label = PageInfoUI::PermissionActionToUIString(
-        profile, info.type, CONTENT_SETTING_ASK, effective_default_setting,
+        profile, info.type, CONTENT_SETTING_ASK, permission_.default_setting,
         info.source);
     AddCheckItem(CONTENT_SETTING_ASK, label);
   }
@@ -70,14 +61,7 @@ PermissionMenuModel::PermissionMenuModel(Profile* profile,
 PermissionMenuModel::~PermissionMenuModel() {}
 
 bool PermissionMenuModel::IsCommandIdChecked(int command_id) const {
-  ContentSetting setting = permission_.setting;
-
-#if BUILDFLAG(ENABLE_PLUGINS)
-  setting = PluginsFieldTrial::EffectiveContentSetting(
-      host_content_settings_map_, permission_.type, permission_.setting);
-#endif  // BUILDFLAG(ENABLE_PLUGINS)
-
-  return setting == command_id;
+  return permission_.setting == command_id;
 }
 
 bool PermissionMenuModel::IsCommandIdEnabled(int command_id) const {