Bug 1099095 - delay checking webrtc window until it closes, r=florian

--HG--
extra : rebase_source : a80d27b122ab2d62215cc79f98532e7c9b332370

browser/base/content/test/general/head.js

@@ -665,6 +665,19 @@ function assertWebRTCIndicatorStatus(expected) {
   }
 
   if (!("nsISystemStatusBar" in Ci)) {
+    if (!expected) {
+      let win = Services.wm.getMostRecentWindow("Browser:WebRTCGlobalIndicator");
+      if (win) {
+        yield new Promise((resolve, reject) => {
+          win.addEventListener("unload", (e) => {
+            if (e.target == win.document) {
+              win.removeEventListener("unload", arguments.callee);
+              resolve();
+            }
+          }, false);
+        });
+      }
+    }
     let indicator = Services.wm.getEnumerator("Browser:WebRTCGlobalIndicator");
     let hasWindow = indicator.hasMoreElements();
     is(hasWindow, !!expected, "popup " + msg);