Move test runner to a component

components/test_runner/mock_web_audio_device.cc

 // 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.
 
-#include "content/shell/renderer/test_runner/mock_web_audio_device.h"
+#include "components/test_runner/mock_web_audio_device.h"
 
 namespace content {
 
 MockWebAudioDevice::MockWebAudioDevice(double sample_rate)
     : sample_rate_(sample_rate) {}
 
 MockWebAudioDevice::~MockWebAudioDevice() {}
 
 void MockWebAudioDevice::start() {}
 
 void MockWebAudioDevice::stop() {}
 
 double MockWebAudioDevice::sampleRate() {
   return sample_rate_;
 }
 
 }  // namespace content