Fix for scenario where m-line is revived after being set to port 0.

talk/app/webrtc/peerconnection.h

Index: talk/app/webrtc/peerconnection.h
diff --git a/talk/app/webrtc/peerconnection.h b/talk/app/webrtc/peerconnection.h
index 2d388ae9f913912990af0541dd8eae67008da745..53275c9daeccaeda5f771c32266b8e05efe35b52 100644
--- a/talk/app/webrtc/peerconnection.h
+++ b/talk/app/webrtc/peerconnection.h
@@ -236,6 +236,10 @@ class PeerConnection : public PeerConnectionInterface,
       const MediaConstraintsInterface* constraints,
       cricket::MediaSessionOptions* session_options);
 
+  // Remove all local and remote tracks of type |media_type|.
+  // Called when a media type is rejected (m-line set to port 0).
+  void RemoveTracks(cricket::MediaType media_type);
+
   // Makes sure a MediaStream Track is created for each StreamParam in
   // |streams|. |media_type| is the type of the |streams| and can be either
   // audio or video.