components: Cleanup class/struct fwd declarations

components/sync/engine_impl/commit_util.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_SYNC_ENGINE_IMPL_COMMIT_UTIL_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_UTIL_H_
 
 #include <stdint.h>
 
 #include <set>
 
 #include "components/sync/base/extensions_activity.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/protocol/sync.pb.h"
 
 namespace sync_pb {
 class CommitMessage;
 class SyncEntity;
 }
 
 namespace syncer {
 
 namespace syncable {
-class BaseTransaction;
 class Entry;
 class Id;
 class BaseWriteTransaction;
 }
 
 namespace commit_util {
 
 // Adds bookmark extensions activity report to |message|.
 void AddExtensionsActivityToMessage(
     ExtensionsActivity* activity,
@@ skipping 21 matching lines @@
     const sync_pb::CommitResponse_EntryResponse& server_entry,
     const sync_pb::SyncEntity& commit_request_entry,
     int64_t metahandle,
     std::set<syncable::Id>* deleted_folders);
 
 }  // namespace commit_util
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_UTIL_H_