Bug 815110 - Change DOMWifiManager so it returns null instead of creating the object if the caller doesn't have the correct permission. r=mrbkap

dom/wifi/DOMWifiManager.js

@@ -69,6 +69,10 @@ DOMWifiManager.prototype = {
     // Only pages with perm set can use the wifi manager.
     this._hasPrivileges = perm == Ci.nsIPermissionManager.ALLOW_ACTION;
 
+    if (!this._hasPrivileges) {
+      return null;
+    }
+
     // Maintain this state for synchronous APIs.
     this._currentNetwork = null;
     this._connectionStatus = "disconnected";