[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/sources/AddSourceMapURLDialog.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.DialogDelegate}
  * @param {function(string)} callback
  */
 WebInspector.AddSourceMapURLDialog = function(callback)
 {
     WebInspector.DialogDelegate.call(this);
 
-    this.element = document.createElementWithClass("div", "go-to-line-dialog");
+    this.element = createElementWithClass("div", "go-to-line-dialog");
     this.element.createChild("label").textContent = WebInspector.UIString("Source map URL: ");
 
     this._input = this.element.createChild("input");
     this._input.setAttribute("type", "text");
 
     this._goButton = this.element.createChild("button");
     this._goButton.textContent = WebInspector.UIString("Go");
     this._goButton.addEventListener("click", this._onGoClick.bind(this), false);
 
     this._callback = callback;
@@ skipping 27 matching lines @@
         this._callback(value);
     },
 
     onEnter: function()
     {
         this._apply();
     },
 
     __proto__: WebInspector.DialogDelegate.prototype
 }