Move //components/test_runner back into //content/shell

components/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 COMPONENTS_TEST_RUNNER_MOCK_WEB_AUDIO_DEVICE_H_
-#define COMPONENTS_TEST_RUNNER_MOCK_WEB_AUDIO_DEVICE_H_
-
-#include "base/macros.h"
-#include "third_party/WebKit/public/platform/WebAudioDevice.h"
-
-namespace test_runner {
-
-class MockWebAudioDevice : public blink::WebAudioDevice {
- public:
-  explicit MockWebAudioDevice(double sample_rate, int frames_per_buffer);
-  ~MockWebAudioDevice() override;
-
-  // blink::WebAudioDevice:
-  void start() override;
-  void stop() override;
-  double sampleRate() override;
-  int framesPerBuffer() override;
-
- private:
-  double sample_rate_;
-  int frames_per_buffer_;
-
-  DISALLOW_COPY_AND_ASSIGN(MockWebAudioDevice);
-};
-
-}  // namespace test_runner
-
-#endif  // COMPONENTS_TEST_RUNNER_MOCK_WEB_AUDIO_DEVICE_H_