[Sync] Replace ClearServerDataCallback with Closure.

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>
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "components/sync/base/cryptographer.h"
 #include "components/sync/base/time.h"
 #include "components/sync/engine/sync_manager.h"
 #include "components/sync/engine_impl/all_status.h"
 #include "components/sync/engine_impl/debug_info_event_listener.h"
 #include "components/sync/engine_impl/events/protocol_event_buffer.h"
 #include "components/sync/engine_impl/js_mutation_event_observer.h"
 #include "components/sync/engine_impl/js_sync_encryption_handler_observer.h"
@@ skipping 71 matching lines @@
   SyncEncryptionHandler* GetEncryptionHandler() override;
   std::vector<std::unique_ptr<ProtocolEvent>> GetBufferedProtocolEvents()
       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;
 
   // SyncEncryptionHandler::Observer implementation.
   void OnPassphraseRequired(
       PassphraseRequiredReason reason,
       const sync_pb::EncryptedData& pending_keys) override;
   void OnPassphraseAccepted() override;
   void OnBootstrapTokenUpdated(const std::string& bootstrap_token,
                                BootstrapTokenType type) override;
@@ skipping 206 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_