[Sync] Replace ClearServerDataCallback with Closure.

components/sync/engine/fake_sync_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_ENGINE_FAKE_SYNC_MANAGER_H_
 #define COMPONENTS_SYNC_ENGINE_FAKE_SYNC_MANAGER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "components/sync/engine/fake_model_type_connector.h"
 #include "components/sync/engine/sync_manager.h"
 #include "components/sync/syncable/test_user_share.h"
 #include "components/sync/test/fake_sync_encryption_handler.h"
 
 namespace base {
 class SequencedTaskRunner;
@@ skipping 85 matching lines @@
   std::vector<std::unique_ptr<ProtocolEvent>> GetBufferedProtocolEvents()
       override;
   void RefreshTypes(ModelTypeSet types) override;
   void RegisterDirectoryTypeDebugInfoObserver(
       TypeDebugInfoObserver* observer) override;
   void UnregisterDirectoryTypeDebugInfoObserver(
       TypeDebugInfoObserver* observer) override;
   bool HasDirectoryTypeDebugInfoObserver(
       TypeDebugInfoObserver* observer) override;
   void RequestEmitDebugInfo() override;
-  void ClearServerData(const ClearServerDataCallback& callback) override;
+  void ClearServerData(const base::Closure& callback) override;
   void OnCookieJarChanged(bool account_mismatch, bool empty_jar) override;
   void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd) override;
 
  private:
   scoped_refptr<base::SequencedTaskRunner> sync_task_runner_;
 
   base::ObserverList<SyncManager::Observer> observers_;
 
   // Faked directory state.
   ModelTypeSet initial_sync_ended_types_;
@@ skipping 24 matching lines @@
 
   // Number of invalidations received since startup.
   int num_invalidations_received_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSyncManager);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_FAKE_SYNC_MANAGER_H_