Issue 4497 - Move Utils.getRequestWindow() into child/utils.js

lib/utils.js

Index: lib/utils.js
===================================================================
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -205,36 +205,16 @@ let Utils = exports.Utils =
    * @param {function} callback
    */
   runAsync: function(callback)
   {
     Services.tm.currentThread.dispatch(callback, Ci.nsIEventTarget.DISPATCH_NORMAL);
   },
 
   /**
-   * Gets the DOM window associated with a particular request (if any).
-   */
-  getRequestWindow: function(/**nsIChannel*/ channel) /**nsIDOMWindow*/
-  {
-    try
-    {
-      if (channel.notificationCallbacks)
-        return channel.notificationCallbacks.getInterface(Ci.nsILoadContext).associatedWindow;
-    } catch(e) {}
-
-    try
-    {
-      if (channel.loadGroup && channel.loadGroup.notificationCallbacks)
-        return channel.loadGroup.notificationCallbacks.getInterface(Ci.nsILoadContext).associatedWindow;
-    } catch(e) {}
-
-    return null;
-  },
-
-  /**
    * Generates filter subscription checksum.
    *
    * @param {string[]} lines filter subscription lines (with checksum line removed)
    * @return {String} checksum or null
    */
   generateChecksum: function(lines)
   {
     let stream = null;