MD Settings: Convert C++ handlers to be JavaScript-lifecycle aware.

chrome/browser/ui/webui/settings/site_settings_handler.h

 // Copyright 2016 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_UI_WEBUI_SETTINGS_SITE_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SITE_SETTINGS_HANDLER_H_
 
 #include <vector>
 
 #include "base/scoped_observer.h"
@@ skipping 12 matching lines @@
 
 // Chrome "ContentSettings" settings page UI handler.
 class SiteSettingsHandler : public SettingsPageUIHandler,
                             public content_settings::Observer {
  public:
   explicit SiteSettingsHandler(Profile* profile);
   ~SiteSettingsHandler() override;
 
   // SettingsPageUIHandler:
   void RegisterMessages() override;
+  void OnJavascriptAllowed() override;
+  void OnJavascriptDisallowed() override;
 
   void OnGetUsageInfo(const storage::UsageInfoEntries& entries);
   void OnUsageInfoCleared(storage::QuotaStatusCode code);
 
   // content_settings::Observer:
   void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
                                const ContentSettingsPattern& secondary_pattern,
                                ContentSettingsType content_type,
                                std::string resource_identifier) override;
  private:
+  friend class SiteSettingsHandlerTest;
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, GetAndSetDefault);
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, Origins);
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, Patterns);
 
   // Asynchronously fetches the usage for a given origin. Replies back with
   // OnGetUsageInfo above.
   void HandleFetchUsageTotal(const base::ListValue* args);
 
   // Deletes the storage being used for a given host.
   void HandleClearUsage(const base::ListValue* args);
@@ skipping 22 matching lines @@
 
   // Change observer for content settings.
   ScopedObserver<HostContentSettingsMap, content_settings::Observer> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteSettingsHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SITE_SETTINGS_HANDLER_H_