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

services/ui/gpu/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 SERVICES_UI_GPU_GPU_SERVICE_H_
 #define SERVICES_UI_GPU_GPU_SERVICE_H_
 
 #include "base/callback.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/task/cancelable_task_tracker.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/threading/thread.h"
 #include "build/build_config.h"
 #include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
 #include "gpu/command_buffer/common/activity_flags.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/common/surface_handle.h"
 #include "gpu/ipc/service/gpu_channel.h"
 #include "gpu/ipc/service/gpu_channel_manager.h"
 #include "gpu/ipc/service/gpu_channel_manager_delegate.h"
@@ skipping 179 matching lines @@
 
   base::WeakPtr<GpuService> weak_ptr_;
   base::WeakPtrFactory<GpuService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuService);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_GPU_GPU_SERVICE_H_