Issue 1602 - Use ES6 generators instead of legacy generators

lib/ui.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 639 matching lines @@
   get applicationWindows()
   {
     let {isKnownWindow} = require("appSupport");
 
     let enumerator = Services.wm.getZOrderDOMWindowEnumerator(null, true);
     if (!enumerator.hasMoreElements())
     {
       // On Linux the list returned will be empty, see bug 156333. Fall back to random order.
       enumerator = Services.wm.getEnumerator(null);
     }
-    while (enumerator.hasMoreElements())
+
+    let generate = function*()
     {
-      let window = enumerator.getNext().QueryInterface(Ci.nsIDOMWindow);
-      if (isKnownWindow(window))
-        yield window;
-    }
+      while (enumerator.hasMoreElements())
+      {
+        let window = enumerator.getNext().QueryInterface(Ci.nsIDOMWindow);
+        if (isKnownWindow(window))
+          yield window;
+      }
+    };
+
+    return generate();
   },
 
   /**
    * Returns the top-most application window or null if none exists.
    * @type Window
    */
   get currentWindow()
   {
     for (let window of this.applicationWindows)
       return window;
@@ skipping 1281 matching lines @@
   ["abp-command-contribute", "command", UI.openContributePage.bind(UI)],
   ["abp-command-contribute-hide", "command", UI.hideContributeButton.bind(UI)]
 ];
 
 onShutdown.add(function()
 {
   for (let window in UI.applicationWindows)
     if (UI.isBottombarOpen(window))
       UI.toggleBottombar(window);
 });