Issue 3515 - Adapted polyfill for URL class for consistency

safari/ext/background.js

Index: safari/ext/background.js
===================================================================
--- a/safari/ext/background.js
+++ b/safari/ext/background.js
@@ -167,34 +167,11 @@
   var pages = Object.create(null);
   var pageCounter = 0;
 
-  var Frame = function(url, parent)
-  {
-    this._urlString = url;
-    this._urlObj = null;
-
-    this.parent = parent;
-  }
-  Frame.prototype = {
-    get url()
-    {
-      // On Safari 6 and before, the URL constuctor doesn't exist.
-      // The "urls" module provides a polifill, but it might not
-      // be loaded yet. So we have to lazily parse URLs.
-      if (!this._urlObj)
-      {
-        this._urlObj = new URL(this._urlString);
-        this._urlString = null;
-      }
-
-      return this._urlObj;
-    }
-  };
-
   var Page = function(id, tab, url)
   {
     this._id = id;
     this._tab = tab;
-    this._frames = [new Frame(url, null)];
+    this._frames = [{url: new URL(url), parent: null}];
 
     if (tab.page)
       this._messageProxy = new ext._MessageProxy(tab.page);
@@ -644,7 +621,7 @@
               }
 
               frameId = page._frames.length;
-              page._frames.push(new Frame(message.url, parentFrame));
+              page._frames.push({url: new URL(message.url), parent: parentFrame});
             }
             event.message = {pageId: pageId, frameId: frameId};
             break;