[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/extensions/ExtensionPanel.js

 /*
  * Copyright (C) 2012 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 100 matching lines @@
  * @constructor
  * @param {!WebInspector.ExtensionServer} server
  * @param {string} id
  * @param {string} iconURL
  * @param {string=} tooltip
  * @param {boolean=} disabled
  */
 WebInspector.ExtensionButton = function(server, id, iconURL, tooltip, disabled)
 {
     this._id = id;
-    this.element = document.createElement("button");
+    this.element = createElement("button");
     this.element.className = "status-bar-item extension";
     this.element.addEventListener("click", server.notifyButtonClicked.bind(server, this._id), false);
     this.update(iconURL, tooltip, disabled);
 }
 
 WebInspector.ExtensionButton.prototype = {
     /**
      * @param {string} iconURL
      * @param {string=} tooltip
      * @param {boolean=} disabled
@@ skipping 120 matching lines @@
         if (!title)
             section.headerElement.classList.add("hidden");
         section.expanded = true;
         section.editable = false;
         this._objectPropertiesView.element.appendChild(section.element);
         callback();
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }