[Cast] Track audio queued in encoder; account for it in ShouldDropNextFrame().

media/cast/sender/video_sender.h

Index: media/cast/sender/video_sender.h
diff --git a/media/cast/sender/video_sender.h b/media/cast/sender/video_sender.h
index d2dfa45f4212fe33c687f62cedb4db91eaf72e58..fb403a60bcfe1f761d1b8accb0511b39b66ffc06 100644
--- a/media/cast/sender/video_sender.h
+++ b/media/cast/sender/video_sender.h
@@ -61,12 +61,6 @@ class VideoSender : public FrameSender,
   void OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback);
 
  private:
-  // Returns true if there are too many frames in flight, or if the media
-  // duration of the frames in flight would be too high by sending the next
-  // frame.  The latter metric is determined from the given |capture_time|
-  // for the next frame to be encoded and sent.
-  bool ShouldDropNextFrame(base::TimeTicks capture_time) const;
-
   // Called by the |video_encoder_| with the next EncodeFrame to send.
   void SendEncodedVideoFrame(int requested_bitrate_before_encode,
                              scoped_ptr<EncodedFrame> encoded_frame);
@@ -80,8 +74,6 @@ class VideoSender : public FrameSender,
   // a hardware-based encoder.
   scoped_ptr<VideoEncoder> video_encoder_;
 
-  // The number of frames currently being processed in |video_encoder_|.
-  int frames_in_encoder_;
 
   // When we get close to the max number of un-acked frames, we set lower
   // the bitrate drastically to ensure that we catch up. Without this we