Replace deprecated base::NonThreadSafe in media/gpu in favor of SequenceChecker.

media/gpu/ipc/client/gpu_video_decode_accelerator_host.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 MEDIA_GPU_IPC_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
 #define MEDIA_GPU_IPC_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequence_checker.h"
 #include "base/single_thread_task_runner.h"
-#include "base/threading/non_thread_safe.h"
 #include "gpu/ipc/client/command_buffer_proxy_impl.h"
 #include "ipc/ipc_listener.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 
 struct AcceleratedVideoDecoderHostMsg_PictureReady_Params;
 
 namespace gpu {
 class GpuChannelHost;
 }
 
 namespace media {
 
 // This class is used to talk to VideoDecodeAccelerator in the Gpu process
 // through IPC messages.
 class GpuVideoDecodeAcceleratorHost
     : public IPC::Listener,
       public VideoDecodeAccelerator,
-      public gpu::CommandBufferProxyImpl::DeletionObserver,
-      public base::NonThreadSafe {
+      public gpu::CommandBufferProxyImpl::DeletionObserver {
  public:
   // |this| is guaranteed not to outlive |impl|.  (See comments for |impl_|.)
   explicit GpuVideoDecodeAcceleratorHost(gpu::CommandBufferProxyImpl* impl);
 
   // IPC::Listener implementation.
   void OnChannelError() override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // VideoDecodeAccelerator implementation.
   bool Initialize(const Config& config, Client* client) override;
@@ skipping 53 matching lines @@
 
   // Requested dimensions of the buffer, from ProvidePictureBuffers().
   gfx::Size picture_buffer_dimensions_;
 
   // Task runner for tasks that should run on the thread this class is
   // constructed.
   scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
 
   // WeakPtr for posting tasks to ourself.
   base::WeakPtr<GpuVideoDecodeAcceleratorHost> weak_this_;
+
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<GpuVideoDecodeAcceleratorHost> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuVideoDecodeAcceleratorHost);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_IPC_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_