Update talk to 50918584.

Together with Stefan's http://review.webrtc.org/1960004/.

R=mallinath@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2048004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4556 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/main/test/receiver_tests.h

@@ -22,7 +22,7 @@
 #include <stdio.h>
 #include <string>
 
-class RtpDataCallback : public webrtc::RtpData {
+class RtpDataCallback : public webrtc::NullRtpData {
  public:
   RtpDataCallback(webrtc::VideoCodingModule* vcm) : vcm_(vcm) {}
   virtual ~RtpDataCallback() {}