Move GPU device/driver info related code from content to gpu.

content/browser/gpu/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 CONTENT_BROWSER_GPU_GPU_SWITCHING_LIST_H_
-#define CONTENT_BROWSER_GPU_GPU_SWITCHING_LIST_H_
-
-#include <string>
-
-#include "content/browser/gpu/gpu_control_list.h"
-
-namespace content {
-
-class CONTENT_EXPORT GpuSwitchingList : public GpuControlList {
- public:
-  virtual ~GpuSwitchingList();
-
-  static GpuSwitchingList* Create();
-
- private:
-  GpuSwitchingList();
-
-  DISALLOW_COPY_AND_ASSIGN(GpuSwitchingList);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GPU_GPU_SWITCHING_LIST_H_
-