Interpolate media time for mojo rendering pipeline.

media/renderers/audio_renderer_impl.h

Index: media/renderers/audio_renderer_impl.h
diff --git a/media/renderers/audio_renderer_impl.h b/media/renderers/audio_renderer_impl.h
index 3b646ed2d3c0e1879ad720f814549267408820dd..d76ba06621e94ba6bd0a3a5d2cc39097b5965122 100644
--- a/media/renderers/audio_renderer_impl.h
+++ b/media/renderers/audio_renderer_impl.h
@@ -286,10 +286,6 @@ class MEDIA_EXPORT AudioRendererImpl
   // Used to determine how long to delay playback.
   base::TimeDelta first_packet_timestamp_;
 
-  // Set by CurrentMediaTime(), used to prevent the current media time value as
-  // reported to JavaScript from going backwards in time.
-  base::TimeDelta last_media_timestamp_;
-
   // Set by OnSuspend() and OnResume() to indicate when the system is about to
   // suspend/is suspended and when it resumes.
   bool is_suspending_;