Update {virtual,override} to follow C++11 style in content.

content/renderer/media/webrtc_local_audio_track_unittest.cc

 // 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.
 
 #include "base/synchronization/waitable_event.h"
 #include "base/test/test_timeouts.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "content/renderer/media/mock_media_constraint_factory.h"
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
@@ skipping 78 matching lines @@
   explicit MockCapturerSource(WebRtcAudioCapturer* capturer)
       : capturer_(capturer) {}
   MOCK_METHOD3(OnInitialize, void(const media::AudioParameters& params,
                                   CaptureCallback* callback,
                                   int session_id));
   MOCK_METHOD0(OnStart, void());
   MOCK_METHOD0(OnStop, void());
   MOCK_METHOD1(SetVolume, void(double volume));
   MOCK_METHOD1(SetAutomaticGainControl, void(bool enable));
 
-  virtual void Initialize(const media::AudioParameters& params,
-                          CaptureCallback* callback,
-                          int session_id) override {
+  void Initialize(const media::AudioParameters& params,
+                  CaptureCallback* callback,
+                  int session_id) override {
     DCHECK(params.IsValid());
     params_ = params;
     OnInitialize(params, callback, session_id);
   }
-  virtual void Start() override {
+  void Start() override {
     audio_thread_.reset(new FakeAudioThread(capturer_, params_));
     audio_thread_->Start();
     OnStart();
   }
-  virtual void Stop() override {
+  void Stop() override {
     audio_thread_->Stop();
     audio_thread_.reset();
     OnStop();
   }
  protected:
-  virtual ~MockCapturerSource() {}
+  ~MockCapturerSource() override {}
 
  private:
   scoped_ptr<FakeAudioThread> audio_thread_;
   WebRtcAudioCapturer* capturer_;
   media::AudioParameters params_;
 };
 
 class MockMediaStreamAudioSink : public MediaStreamAudioSink {
  public:
   MockMediaStreamAudioSink() {}
@@ skipping 379 matching lines @@
   // Stopping the new source will stop the second track.
   EXPECT_CALL(*source.get(), OnStop()).Times(1);
   capturer->Stop();
 
   // Even though this test don't use |capturer_source_| it will be stopped
   // during teardown of the test harness.
   EXPECT_CALL(*capturer_source_.get(), OnStop());
 }
 
 }  // namespace content