Fixed race condition in test. Fixed spurious wait requests on shutdown.

chrome/test/data/webrtc/message_handling.js

Index: chrome/test/data/webrtc/message_handling.js
diff --git a/chrome/test/data/webrtc/message_handling.js b/chrome/test/data/webrtc/message_handling.js
index c0cc454009cc269ba5d65d0baa19b2b0be34a674..40bf83d6470b3c19a70105f4934c0db1c3dcfd5e 100644
--- a/chrome/test/data/webrtc/message_handling.js
+++ b/chrome/test/data/webrtc/message_handling.js
@@ -125,13 +125,16 @@ function disconnect() {
   request = new XMLHttpRequest();
   request.open("GET", gServerUrl + "/sign_out?peer_id=" + gOurPeerId, false);
   request.send();
-  request = null;
   gOurPeerId = null;
   returnToPyAuto('ok-disconnected');
 }
 
 // Internals.
 
+function isDisconnected() {
+  return gOurPeerId == null;
+}
+
 function connectCallback(request) {
   debug("Connect callback: " + request.status + ", " + request.readyState);
   if (request.readyState == 4 && request.status == 200) {
@@ -179,6 +182,8 @@ function parseRemotePeerIdIfConnected(responseText) {
 }
 
 function startHangingGet(server, ourId) {
+  if (isDisconnected())
+    return;
   hangingGetRequest = new XMLHttpRequest();
   hangingGetRequest.onreadystatechange = function() {
     hangingGetCallback(hangingGetRequest, server, ourId);