components: Cleanup class/struct fwd declarations

components/sync/engine_impl/sync_manager_impl.h

 // Copyright 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 COMPONENTS_SYNC_ENGINE_IMPL_SYNC_MANAGER_IMPL_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_SYNC_MANAGER_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 15 matching lines @@
 #include "components/sync/engine_impl/net/server_connection_manager.h"
 #include "components/sync/engine_impl/nudge_handler.h"
 #include "components/sync/engine_impl/sync_encryption_handler_impl.h"
 #include "components/sync/engine_impl/sync_engine_event_listener.h"
 #include "components/sync/js/js_backend.h"
 #include "components/sync/syncable/change_reorder_buffer.h"
 #include "components/sync/syncable/directory_change_delegate.h"
 #include "components/sync/syncable/user_share.h"
 #include "net/base/network_change_notifier.h"
 
-class GURL;
-
 namespace syncer {
 
 class ModelTypeRegistry;
 class SyncCycleContext;
 class TypeDebugInfoObserver;
-class WriteNode;
-class WriteTransaction;
 
 // SyncManager encapsulates syncable::Directory and serves as the parent of all
 // other objects in the sync API.  If multiple threads interact with the same
 // local sync repository (i.e. the same sqlite database), they should share a
 // single SyncManager instance.  The caller should typically create one
 // SyncManager for the lifetime of a user session.
 //
 // Unless stated otherwise, all methods of SyncManager should be called on the
 // same thread.
 class SyncManagerImpl
@@ skipping 280 matching lines @@
   std::unique_ptr<SyncEncryptionHandlerImpl> sync_encryption_handler_;
 
   base::WeakPtrFactory<SyncManagerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncManagerImpl);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_SYNC_MANAGER_IMPL_H_