[Cast] Remove AudioDecoder's dependency on WebRTC, and refactor/clean-up AudioReceiver.

media/cast/video_receiver/video_receiver.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/video_receiver/video_receiver.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 21 matching lines @@
 // Used to pass payload data into the video receiver.
 class LocalRtpVideoData : public RtpData {
  public:
   explicit LocalRtpVideoData(VideoReceiver* video_receiver)
       : video_receiver_(video_receiver) {}
 
   virtual ~LocalRtpVideoData() {}
 
   virtual void OnReceivedPayloadData(const uint8* payload_data,
                                      size_t payload_size,
-                                     const RtpCastHeader* rtp_header) OVERRIDE {
+                                     const RtpCastHeader& rtp_header) OVERRIDE {
     video_receiver_->IncomingParsedRtpPacket(
-        payload_data, payload_size, *rtp_header);
+        payload_data, payload_size, rtp_header);
   }
 
  private:
   VideoReceiver* video_receiver_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(LocalRtpVideoData);
 };
 
 // Local implementation of RtpPayloadFeedback (defined in rtp_defines.h)
 // Used to convey cast-specific feedback from receiver to sender.
@@ skipping 495 matching lines @@
 }
 
 void VideoReceiver::UpdateTargetDelay() {
   NOTIMPLEMENTED();
   rtcp_->SetTargetDelay(target_delay_delta_);
   target_delay_cb_.Run(target_delay_delta_);
 }
 
 }  // namespace cast
 }  // namespace media