AudioConverter: Express delay in frames rather than msec.

media/base/loopback_audio_converter.h

Index: media/base/loopback_audio_converter.h
diff --git a/media/base/loopback_audio_converter.h b/media/base/loopback_audio_converter.h
index 9bfd00f228ba2caf2f7d5702bbd0553401f1f373..21815f0ac0dc04f6bc801bbe20709407ac3f0f61 100644
--- a/media/base/loopback_audio_converter.h
+++ b/media/base/loopback_audio_converter.h
@@ -35,8 +35,7 @@ class LoopbackAudioConverter : public AudioConverter::InputCallback {
   bool empty() { return audio_converter_.empty(); }
 
  private:
-  double ProvideInput(AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+  double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override;
 
   AudioConverter audio_converter_;