components: Cleanup class/struct fwd declarations

components/sync/test/engine/mock_connection_manager.h

 // Copyright (c) 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_TEST_ENGINE_MOCK_CONNECTION_MANAGER_H_
 #define COMPONENTS_SYNC_TEST_ENGINE_MOCK_CONNECTION_MANAGER_H_
 
 #include <stdint.h>
 
 #include <bitset>
 #include <list>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/synchronization/lock.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/base/unique_position.h"
 #include "components/sync/engine_impl/net/server_connection_manager.h"
 #include "components/sync/protocol/sync.pb.h"
 
 namespace syncer {
 
+namespace syncable {
+class Directory;
+}
+
 // Mock ServerConnectionManager class for use in client unit tests.
 class MockConnectionManager : public ServerConnectionManager {
  public:
   class MidCommitObserver {
    public:
     virtual void Observe() = 0;
 
    protected:
     virtual ~MidCommitObserver() {}
   };
@@ skipping 371 matching lines @@
   std::string next_token_;
 
   std::vector<sync_pb::ClientToServerMessage> requests_;
 
   DISALLOW_COPY_AND_ASSIGN(MockConnectionManager);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_TEST_ENGINE_MOCK_CONNECTION_MANAGER_H_