Merge gpu_switching_list into gpu_driver_bug_list.

gpu/config/gpu_switching_list.h

-// Copyright (c) 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 GPU_CONFIG_GPU_SWITCHING_LIST_H_
-#define GPU_CONFIG_GPU_SWITCHING_LIST_H_
-
-#include <string>
-
-#include "gpu/config/gpu_control_list.h"
-
-namespace gpu {
-
-class GPU_EXPORT GpuSwitchingList : public GpuControlList {
- public:
-  virtual ~GpuSwitchingList();
-
-  static GpuSwitchingList* Create();
-
- private:
-  GpuSwitchingList();
-
-  DISALLOW_COPY_AND_ASSIGN(GpuSwitchingList);
-};
-
-}  // namespace gpu
-
-#endif  // GPU_CONFIG_GPU_SWITCHING_LIST_H_
-