AudioConverter: Express delay in frames rather than msec.

media/audio/virtual_audio_output_stream.h

Index: media/audio/virtual_audio_output_stream.h
diff --git a/media/audio/virtual_audio_output_stream.h b/media/audio/virtual_audio_output_stream.h
index 7f520a4d195cfe8749b0f377ae278e4ddcdb61ad..4f61f287357e2f0df0cc1ba2cda5523d3750ce5d 100644
--- a/media/audio/virtual_audio_output_stream.h
+++ b/media/audio/virtual_audio_output_stream.h
@@ -47,8 +47,7 @@ class MEDIA_EXPORT VirtualAudioOutputStream
 
  private:
   // AudioConverter::InputCallback:
-  double ProvideInput(AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+  double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override;
 
   const AudioParameters params_;
   // Pointer to the VirtualAudioInputStream to attach to when Start() is called.