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

media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.cc

Index: media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.cc
diff --git a/media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.cc b/media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.cc
index fbf1e9351372f77ac9ff4bc45fbefb4bbc806b01..20339e58813bf298acc6427b846b33b003dccd4d 100644
--- a/media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.cc
+++ b/media/cast/rtp_receiver/rtp_parser/rtp_parser_unittest.cc
@@ -32,9 +32,9 @@ class RtpDataTest : public RtpData {
 
   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) {