Use Mozilla STUN server in apprtc demo for FF. Currently FF cannot work with Google STUN server as it expects XOR-MAPPED address while Google STUN server provides MAPPED address.

R=dutton@google.com

Review URL: https://webrtc-codereview.appspot.com/1849004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4388 4adac7df-926f-26a2-2b94-8c16560cd09d

samples/js/apprtc/js/main.js

@@ -123,6 +123,10 @@
   }
 
   function createPeerConnection() {
+    // For FF, use Mozilla STUN server.
+    if (webrtcDetectedBrowser === "firefox") {
+      pc_config = {"iceServers":[{"url":"stun:stun.services.mozilla.com"}]};
+    }
     try {
       // Create an RTCPeerConnection via the polyfill (adapter.js).
       pc = new RTCPeerConnection(pcConfig, pcConstraints);