Move test runner to a component

content/shell/renderer/test_runner/mock_web_audio_device.h

-// Copyright 2014 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_SHELL_RENDERER_TEST_RUNNER_MOCK_WEB_AUDIO_DEVICE_H_
-#define CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCK_WEB_AUDIO_DEVICE_H_
-
-#include "base/macros.h"
-#include "third_party/WebKit/public/platform/WebAudioDevice.h"
-
-namespace content {
-
-class MockWebAudioDevice : public blink::WebAudioDevice {
- public:
-  explicit MockWebAudioDevice(double sample_rate);
-  virtual ~MockWebAudioDevice();
-
-  // blink::WebAudioDevice:
-  virtual void start();
-  virtual void stop();
-  virtual double sampleRate();
-
- private:
-  double sample_rate_;
-
-  DISALLOW_COPY_AND_ASSIGN(MockWebAudioDevice);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCK_WEB_AUDIO_DEVICE_H_