Remove calls to MessageLoop::current() in components.

components/sync_driver/glue/sync_backend_host_impl.h

 // Copyright 2013 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_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 #include "components/invalidation/public/invalidation_handler.h"
 #include "components/sync_driver/backend_data_type_configurer.h"
 #include "components/sync_driver/glue/sync_backend_host.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/configure_reason.h"
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
 #include "sync/internal_api/public/sessions/type_debug_info_observer.h"
 #include "sync/internal_api/public/sync_manager.h"
 #include "sync/internal_api/public/util/weak_handle.h"
@@ skipping 282 matching lines @@
       const syncer::SyncEncryptionHandler::NigoriState& nigori_state);
 
   // Dispatched to from OnConnectionStatusChange to handle updating
   // frontend UI components.
   void HandleConnectionStatusChangeOnFrontendLoop(
       syncer::ConnectionStatus status);
 
   void ClearServerDataDoneOnFrontendLoop(
       const syncer::SyncManager::ClearServerDataCallback& frontend_callback);
 
-  // A reference to the MessageLoop used to construct |this|, so we know how
-  // to safely talk back to the SyncFrontend.
-  base::MessageLoop* const frontend_loop_;
+  // A reference to the TaskRUnner used to construct |this|, so we know how to
+  // safely talk back to the SyncFrontend.
+  scoped_refptr<base::SingleThreadTaskRunner> const frontend_task_runner_;
 
   sync_driver::SyncClient* const sync_client_;
 
   // The UI thread's task runner.
   const scoped_refptr<base::SingleThreadTaskRunner> ui_thread_;
 
   // Name used for debugging (set from profile_->GetDebugName()).
   const std::string name_;
 
   // Our core, which communicates directly to the syncapi. Use refptr instead
@@ skipping 41 matching lines @@
   bool invalidation_handler_registered_;
 
   base::WeakPtrFactory<SyncBackendHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostImpl);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_