Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/chromeos/extensions/file_browser_event_router.h

 // Copyright (c) 2012 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_CHROMEOS_EXTENSIONS_FILE_BROWSER_EVENT_ROUTER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_BROWSER_EVENT_ROUTER_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/files/file_path_watcher.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/prefs/public/pref_observer.h"
 #include "base/string16.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
 #include "chrome/browser/chromeos/drive/drive_file_system_observer.h"
 #include "chrome/browser/chromeos/drive/drive_resource_metadata.h"
 #include "chrome/browser/google_apis/drive_service_interface.h"
 #include "chrome/browser/google_apis/operation_registry.h"
 #include "chrome/browser/profiles/refcounted_profile_keyed_service.h"
 #include "chrome/browser/profiles/refcounted_profile_keyed_service_factory.h"
 #include "chromeos/disks/disk_mount_manager.h"
-#include "content/public/browser/notification_details.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_source.h"
 
 class FileBrowserNotifications;
 class PrefChangeRegistrar;
 class Profile;
 
 namespace drive {
 class DriveEntryProto;
 class DriveFileSystemInterface;
 }
 
 // Monitors changes in disk mounts, network connection state and preferences
 // affecting File Manager. Dispatches appropriate File Browser events.
 class FileBrowserEventRouter
     : public RefcountedProfileKeyedService,
       public chromeos::disks::DiskMountManager::Observer,
       public chromeos::NetworkLibrary::NetworkManagerObserver,
-      public content::NotificationObserver,
+      public PrefObserver,
       public drive::DriveFileSystemObserver,
       public google_apis::DriveServiceObserver {
  public:
   // RefcountedProfileKeyedService overrides.
   virtual void ShutdownOnUIThread() OVERRIDE;
 
   // Starts observing file system change events. Currently only
   // CrosDisksClient events are being observed.
   void ObserveFileSystemEvents();
 
@@ skipping 17 matching lines @@
   virtual void MountCompleted(
       chromeos::disks::DiskMountManager::MountEvent event_type,
       chromeos::MountError error_code,
       const chromeos::disks::DiskMountManager::MountPointInfo& mount_info)
       OVERRIDE;
 
   // chromeos::NetworkLibrary::NetworkManagerObserver override.
   virtual void OnNetworkManagerChanged(
       chromeos::NetworkLibrary* network_library) OVERRIDE;
 
-  // Overridden from content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // Overridden from PrefObserver.
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
 
   // drive::DriveServiceObserver overrides.
   virtual void OnProgressUpdate(
       const google_apis::OperationProgressStatusList& list) OVERRIDE;
   virtual void OnAuthenticationFailed(
       google_apis::GDataErrorCode error) OVERRIDE;
 
   // drive::DriveFileSystemInterface::Observer overrides.
   virtual void OnDirectoryChanged(const FilePath& directory_path) OVERRIDE;
   virtual void OnDocumentFeedFetched(int num_accumulated_entries) OVERRIDE;
@@ skipping 145 matching lines @@
 
   FileBrowserEventRouterFactory();
   virtual ~FileBrowserEventRouterFactory();
 
   // ProfileKeyedServiceFactory:
   virtual scoped_refptr<RefcountedProfileKeyedService> BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_BROWSER_EVENT_ROUTER_H_