components: Cleanup class/struct fwd declarations

components/drive/drive_notification_manager.h

 // Copyright 2013 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 COMPONENTS_DRIVE_DRIVE_NOTIFICATION_MANAGER_H_
 #define COMPONENTS_DRIVE_DRIVE_NOTIFICATION_MANAGER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
 #include "components/drive/drive_notification_observer.h"
 #include "components/invalidation/public/invalidation_handler.h"
 #include "components/keyed_service/core/keyed_service.h"
 
-namespace browser_sync {
-class ProfileSyncService;
-}  // namespace browser_sync
-
 namespace invalidation {
 class InvalidationService;
 }  // namespace invalidation
 
 namespace drive {
 
 // Informs observers when they should check Google Drive for updates.
 // Conditions under which updates should be searched:
 // 1. XMPP invalidation is received from Google Drive.
 // 2. Polling timer counts down.
@@ skipping 62 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DriveNotificationManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveNotificationManager);
 };
 
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_DRIVE_NOTIFICATION_MANAGER_H_