Remove base::NonThreadSafe now that all users are gone!!

media/gpu/dxva_video_decode_accelerator_win.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_DXVA_VIDEO_DECODE_ACCELERATOR_WIN_H_
 #define MEDIA_GPU_DXVA_VIDEO_DECODE_ACCELERATOR_WIN_H_
 
 #include <d3d11_1.h>
 #include <d3d9.h>
 #include <initguid.h>
@@ skipping 10 matching lines @@
 #include <list>
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/threading/thread.h"
 #include "base/win/scoped_comptr.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "media/base/video_color_space.h"
 #include "media/filters/h264_parser.h"
 #include "media/gpu/gpu_video_decode_accelerator_helpers.h"
 #include "media/gpu/media_gpu_export.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/color_space.h"
 
@@ skipping 553 matching lines @@
 
   // Function pointer for the MFCreateDXGIDeviceManager API.
   static CreateDXGIDeviceManager create_dxgi_device_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(DXVAVideoDecodeAccelerator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_DXVA_VIDEO_DECODE_ACCELERATOR_WIN_H_