[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/elements/PlatformFontsSidebarPane.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 /**
  * @constructor
  * @extends {WebInspector.SidebarPane}
  */
 WebInspector.PlatformFontsSidebarPane = function()
 {
     WebInspector.SidebarPane.call(this, WebInspector.UIString("Fonts"));
     this.element.classList.add("platform-fonts");
 
-    this._sectionTitle = document.createElementWithClass("div", "sidebar-separator");
+    this._sectionTitle = createElementWithClass("div", "sidebar-separator");
     this.element.insertBefore(this._sectionTitle, this.bodyElement);
     this._sectionTitle.textContent = WebInspector.UIString("Rendered Fonts");
     this._fontStatsSection = this.bodyElement.createChild("div", "stats-section");
 }
 
 WebInspector.PlatformFontsSidebarPane.prototype = {
     _onNodeChange: function()
     {
         if (this._innerUpdateTimeout)
             return;
@@ skipping 72 matching lines @@
             fontDelimeterElement.textContent = "\u2014";
 
             var fontUsageElement = fontStatElement.createChild("span", "font-usage");
             var usage = platformFonts[i].glyphCount;
             fontUsageElement.textContent = usage === 1 ? WebInspector.UIString("%d glyph", usage) : WebInspector.UIString("%d glyphs", usage);
         }
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }