Issue 653 -Object.defineProperty instead of defineGetter / defineSetter

chrome/content/ui/progressBar.js

Index: chrome/content/ui/progressBar.js
===================================================================
--- a/chrome/content/ui/progressBar.js
+++ b/chrome/content/ui/progressBar.js
@@ -27,20 +27,26 @@
     progressBar = document.getElementById("progressBar");
     canvas = document.getElementById("progressBarCanvas");
 
     headers = Array.prototype.slice.call(progressBar.getElementsByTagName("label"));
     for (let i = 0; i < headers.length; i++)
       canvas.parentNode.appendChild(headers[i]);
 
     // Expose properties
-    progressBar.__defineGetter__("activeItem", getActiveItem);
-    progressBar.__defineSetter__("activeItem", setActiveItem);
-    progressBar.__defineGetter__("activeItemComplete", getActiveItemComplete);
-    progressBar.__defineSetter__("activeItemComplete", setActiveItemComplete);
+    Object.defineProperty(progressBar, "activeItem",
+    {
+      get: getActiveItem,
+      set: setActiveItem
+    });
+    Object.defineProperty(progressBar, "activeItemComplete",
+    {
+      get: getActiveItemComplete,
+      set: setActiveItemComplete
+    });
 
     isRTL = (window.getComputedStyle(document.documentElement).direction == "rtl");
 
     // Run actual drawing delayed, once the sizes are fixed
     window.setTimeout(init, 0);
   };
   window.addEventListener("load", onLoad, false);