chrome: Cleanup class/struct forward declarations

chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_LOCAL_TO_REMOTE_SYNCER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_LOCAL_TO_REMOTE_SYNCER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 11 matching lines @@
 class DriveServiceInterface;
 class DriveUploaderInterface;
 }
 
 namespace google_apis {
 class FileResource;
 }
 
 namespace sync_file_system {
 
-class RemoteChangeProcessor;
-
 namespace drive_backend {
 
 class FileDetails;
 class FileTracker;
 class FolderCreator;
 class MetadataDatabase;
 class SyncEngineContext;
 
 class LocalToRemoteSyncer : public SyncTask {
  public:
@@ skipping 85 matching lines @@
 
   base::WeakPtrFactory<LocalToRemoteSyncer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalToRemoteSyncer);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_LOCAL_TO_REMOTE_SYNCER_H_