Added volume adjust sound behind the flag.

media/audio/sounds/sounds_manager.cc

Index: media/audio/sounds/sounds_manager.cc
diff --git a/media/audio/sounds/sounds_manager.cc b/media/audio/sounds/sounds_manager.cc
index e93dc6588dde598ef27263eaa4f351b543a5d808..f8f5377ecd0be903d0c4357d9a63fdd59d45770c 100644
--- a/media/audio/sounds/sounds_manager.cc
+++ b/media/audio/sounds/sounds_manager.cc
@@ -73,10 +73,8 @@ base::TimeDelta SoundsManagerImpl::GetDuration(SoundKey key) {
       !handlers_[key]->IsInitialized()) {
     return base::TimeDelta();
   }
-  const WavAudioHandler& wav_audio = handlers_[key]->wav_audio_handler();
-  const int64 size = wav_audio.size();
-  const int64 rate = wav_audio.byte_rate();
-  return base::TimeDelta::FromMicroseconds(size * 1000000 / rate);
+  const WavParser& wav_parser = handlers_[key]->wav_parser();
+  return wav_parser.duration();
 }
 
 // SoundsManagerStub ---------------------------------------------------