Cleanup: IWYU for base/gtest_prod_util.h.

sync/internal_api/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 SYNC_INTERNAL_API_SYNC_MANAGER_H_
-#define SYNC_INTERNAL_API_SYNC_MANAGER_H_
+#ifndef SYNC_INTERNAL_API_SYNC_MANAGER_IMPL_H_
+#define SYNC_INTERNAL_API_SYNC_MANAGER_IMPL_H_
 
 #include <string>
 #include <vector>
 
+#include "base/gtest_prod_util.h"
 #include "net/base/network_change_notifier.h"
 #include "sync/base/sync_export.h"
 #include "sync/engine/all_status.h"
 #include "sync/engine/net/server_connection_manager.h"
 #include "sync/engine/nudge_handler.h"
 #include "sync/engine/sync_engine_event_listener.h"
 #include "sync/internal_api/change_reorder_buffer.h"
 #include "sync/internal_api/debug_info_event_listener.h"
 #include "sync/internal_api/js_mutation_event_observer.h"
 #include "sync/internal_api/js_sync_encryption_handler_observer.h"
@@ skipping 321 matching lines @@
   // with the cryptographer.
   scoped_ptr<SyncEncryptionHandlerImpl> sync_encryption_handler_;
 
   base::WeakPtrFactory<SyncManagerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncManagerImpl);
 };
 
 }  // namespace syncer
 
-#endif  // SYNC_INTERNAL_API_SYNC_MANAGER_H_
+#endif  // SYNC_INTERNAL_API_SYNC_MANAGER_IMPL_H_