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

media/audio/win/audio_low_latency_input_win_unittest.cc

 // Copyright (c) 2012 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 <windows.h>
 #include <mmsystem.h>
 
 #include "base/basictypes.h"
 #include "base/environment.h"
 #include "base/files/file_util.h"
@@ skipping 44 matching lines @@
         num_received_audio_frames_(0) {}
 
   bool error() const { return error_; }
   int num_received_audio_frames() const { return num_received_audio_frames_; }
 
   // Waits until OnData() is called on another thread.
   void WaitForData() {
     data_event_.Wait();
   }
 
-  virtual void OnData(AudioInputStream* stream,
-                      const AudioBus* src,
-                      uint32 hardware_delay_bytes,
-                      double volume) override {
+  void OnData(AudioInputStream* stream,
+              const AudioBus* src,
+              uint32 hardware_delay_bytes,
+              double volume) override {
     EXPECT_NE(hardware_delay_bytes, 0u);
     num_received_audio_frames_ += src->frames();
     data_event_.Signal();
   }
 
-  virtual void OnError(AudioInputStream* stream) override {
+  void OnError(AudioInputStream* stream) override {
     error_ = true;
   }
 
  private:
   int num_received_audio_frames_;
   base::WaitableEvent data_event_;
   bool error_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioInputCallback);
 };
@@ skipping 385 matching lines @@
   WriteToFileAudioSink file_sink(file_name, aisw.bits_per_sample());
   VLOG(0) << ">> Speak into the default microphone while recording.";
   ais->Start(&file_sink);
   base::PlatformThread::Sleep(TestTimeouts::action_timeout());
   ais->Stop();
   VLOG(0) << ">> Recording has stopped.";
   ais.Close();
 }
 
 }  // namespace media