Switch browser side audio capture path to use base time primitives.

media/base/audio_capturer_source.h

Index: media/base/audio_capturer_source.h
diff --git a/media/base/audio_capturer_source.h b/media/base/audio_capturer_source.h
index d355a1b06a296e5bbcb0f6084e36f282dfde0574..dfd609414fc506bdfcc0e77c063bd7f6b5f1afcf 100644
--- a/media/base/audio_capturer_source.h
+++ b/media/base/audio_capturer_source.h
@@ -31,8 +31,8 @@ class AudioCapturerSource
     virtual void OnCaptureStarted() {}
 
     // Callback to deliver the captured data from the OS.
-    // TODO(chcunningham): Update delay argument to use frames instead of
-    // milliseconds to prevent loss of precision. See http://crbug.com/587291.
+    // TODO(chcunningham): Update delay argument to use base::TimeDelta instead
+    // of milliseconds to prevent precision loss. See http://crbug.com/587291.
     virtual void Capture(const AudioBus* audio_source,
                          int audio_delay_milliseconds,
                          double volume,