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

lib/child/elemHide.js

Index: lib/child/elemHide.js
===================================================================
--- a/lib/child/elemHide.js
+++ b/lib/child/elemHide.js
@@ -31,17 +31,17 @@ catch (e)
 {
   Cu.reportError(e);
 }
 
 let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
 let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
 
 let {shouldAllowAsync} = require("child/contentPolicy");
-let {getFrames, isPrivate} = require("child/utils");
+let {getFrames, isPrivate, getRequestWindow} = require("child/utils");
 let {RequestNotifier} = require("child/requestNotifier");
 let {port} = require("messaging");
 let {Utils} = require("utils");
 
 const notImplemented = () => Cr.NS_ERROR_NOT_IMPLEMENTED;
 
 /**
  * about: URL module used to count hits.
@@ -263,17 +263,17 @@ function HitRegistrationChannel(uri, loa
 }
 HitRegistrationChannel.prototype = {
   __proto__: BaseChannel.prototype,
   key: null,
   contentType: "text/xml",
 
   _getResponse: function()
   {
-    let window = Utils.getRequestWindow(this);
+    let window = getRequestWindow(this);
     port.emitWithResponse("registerElemHideHit", {
       key: this.key,
       frames: getFrames(window),
       isPrivate: isPrivate(window)
     }).then(hit =>
     {
       if (hit)
         RequestNotifier.addNodeData(window.document, window.top, hit);