Fixing CallAndModifyStream test, preparing for new addStream behavior.

content/test/data/media/peerconnection-call.html

Index: content/test/data/media/peerconnection-call.html
diff --git a/content/test/data/media/peerconnection-call.html b/content/test/data/media/peerconnection-call.html
index f84ded58a82b74720b3cc2bc1ebeaa5603d7ad96..a65166a7e5e722bb5e7c553b59688f01c2cd9a33 100644
--- a/content/test/data/media/peerconnection-call.html
+++ b/content/test/data/media/peerconnection-call.html
@@ -545,9 +545,14 @@
       setAllEventsOccuredHandler(reportTestSuccess);
 
       gFirstConnection.removeStream(localStream);
+      gSecondConnection.removeStream(localStream);
+
       localStream.addTrack(gLocalStream.getAudioTracks()[0]);
       localStream.removeTrack(localStream.getVideoTracks()[0]);
+
       gFirstConnection.addStream(localStream);
+      gSecondConnection.addStream(localStream);
+
       negotiate();
     });
   }