test_runner: Move more Mock* files into content namespace.

content/shell/renderer/test_runner/MockWebAudioDevice.h

 // Copyright 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_SHELL_RENDERER_TEST_RUNNER_MOCKWEBAUDIODEVICE_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKWEBAUDIODEVICE_H_
 
 #include "base/basictypes.h"
 #include "content/shell/renderer/test_runner/TestCommon.h"
 #include "third_party/WebKit/public/platform/WebAudioDevice.h"
 
-namespace WebTestRunner {
+namespace content {
 
 class MockWebAudioDevice : public blink::WebAudioDevice {
 public:
     explicit MockWebAudioDevice(double sampleRate);
     virtual ~MockWebAudioDevice();
 
     virtual void start();
     virtual void stop();
     virtual double sampleRate();
 
 private:
     double m_sampleRate;
 
     DISALLOW_COPY_AND_ASSIGN(MockWebAudioDevice);
 };
 
-} // namespace WebTestRunner
+} // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKWEBAUDIODEVICE_H_