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

components/mus/common/gpu_service.h

 // Copyright 2016 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_MUS_COMMON_GPU_SERVICE_H_
 #define COMPONENTS_MUS_COMMON_GPU_SERVICE_H_
 
 #include <stdint.h>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "components/mus/common/mus_common_export.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
 
 namespace shell {
 class Connector;
 }
 
@@ skipping 14 matching lines @@
 
   GpuService();
   ~GpuService() override;
 
   // gpu::GpuChannelHostFactory overrides:
   bool IsMainThread() override;
   scoped_refptr<base::SingleThreadTaskRunner> GetIOThreadTaskRunner() override;
   std::unique_ptr<base::SharedMemory> AllocateSharedMemory(
       size_t size) override;
 
-  base::MessageLoop* main_message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
   base::WaitableEvent shutdown_event_;
   base::Thread io_thread_;
   std::unique_ptr<MojoGpuMemoryBufferManager> gpu_memory_buffer_manager_;
 
   // Lock for |gpu_channel_|.
   base::Lock lock_;
   scoped_refptr<gpu::GpuChannelHost> gpu_channel_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuService);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_LIB_GPU_SERVICE_CONNECTION_H_