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

media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.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 <gtest/gtest.h>
 
 #include "base/memory/scoped_ptr.h"
 #include "media/cast/rtp_receiver/rtp_parser/rtp_parser.h"
 #include "media/cast/rtp_receiver/rtp_parser/test/rtp_packet_builder.h"
 #include "media/cast/rtp_receiver/rtp_receiver.h"
@@ skipping 14 matching lines @@
   RtpDataTest() { expected_header_.reset(new RtpCastHeader()); }
 
   virtual ~RtpDataTest() {}
 
   void SetExpectedHeader(const RtpCastHeader& cast_header) {
     memcpy(expected_header_.get(), &cast_header, sizeof(RtpCastHeader));
   }
 
   virtual void OnReceivedPayloadData(const uint8* payloadData,
                                      size_t payloadSize,
-                                     const RtpCastHeader* rtpHeader) OVERRIDE {
-    VerifyCommonHeader(*rtpHeader);
-    VerifyCastHeader(*rtpHeader);
+                                     const RtpCastHeader& rtpHeader) OVERRIDE {
+    VerifyCommonHeader(rtpHeader);
+    VerifyCastHeader(rtpHeader);
   }
 
   void VerifyCommonHeader(const RtpCastHeader& parsed_header) {
     EXPECT_EQ(expected_header_->packet_id == expected_header_->max_packet_id,
               parsed_header.webrtc.header.markerBit);
     EXPECT_EQ(kTestPayloadType, parsed_header.webrtc.header.payloadType);
     EXPECT_EQ(kTestSsrc, parsed_header.webrtc.header.ssrc);
     EXPECT_EQ(0, parsed_header.webrtc.header.numCSRCs);
   }
 
@@ skipping 138 matching lines @@
   uint8 packet[kPacketLength];
   packet_builder_.BuildHeader(packet, kPacketLength);
   // Parse packet as is.
   RtpCastHeader rtp_header;
   rtp_data_->SetExpectedHeader(cast_header_);
   EXPECT_TRUE(rtp_parser_->ParsePacket(packet, kPacketLength, &rtp_header));
 }
 
 }  //  namespace cast
 }  //  namespace media