[Sync] Replace ClearServerDataCallback with Closure.

components/sync/engine/fake_sync_manager.cc

 // 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.
 
 #include "components/sync/engine/fake_sync_manager.h"
 
 #include <cstddef>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 242 matching lines @@
 }
 
 ModelTypeSet FakeSyncManager::GetLastRefreshRequestTypes() {
   return last_refresh_request_types_;
 }
 
 void FakeSyncManager::SetInvalidatorEnabled(bool invalidator_enabled) {
   // Do nothing.
 }
 
-void FakeSyncManager::ClearServerData(const ClearServerDataCallback& callback) {
+void FakeSyncManager::ClearServerData(const base::Closure& callback) {
   callback.Run();
 }
 
 void FakeSyncManager::OnCookieJarChanged(bool account_mismatch,
                                          bool empty_jar) {}
 
 void FakeSyncManager::OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace syncer