components: Cleanup class/struct fwd declarations

components/sync/driver/generic_change_processor.h

 // Copyright 2014 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_SYNC_DRIVER_GENERIC_CHANGE_PROCESSOR_H_
 #define COMPONENTS_SYNC_DRIVER_GENERIC_CHANGE_PROCESSOR_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "components/sync/model/attachments/attachment_service.h"
 #include "components/sync/model/attachments/attachment_service_proxy.h"
 #include "components/sync/model/attachments/attachment_store.h"
 #include "components/sync/model/change_processor.h"
 #include "components/sync/model/data_type_error_handler.h"
 #include "components/sync/model/sync_change_processor.h"
 #include "components/sync/model/sync_merge_result.h"
 
 namespace syncer {
 
-class SyncApiComponentFactory;
 class SyncClient;
 class SyncData;
 class SyncableService;
 class WriteNode;
 class WriteTransaction;
 
 namespace syncable {
 class Entry;
 }  // namespace syncable
 
@@ skipping 147 matching lines @@
       attachment_service_weak_ptr_factory_;
   AttachmentServiceProxy attachment_service_proxy_;
   base::WeakPtrFactory<GenericChangeProcessor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GenericChangeProcessor);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_GENERIC_CHANGE_PROCESSOR_H_