DevTools: Reduce code via using document.createElementWithClass and document.createChild.

Source/devtools/front_end/ui/Popover.js

 /*
  * Copyright (C) 2009 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 22 matching lines @@
  * @extends {WebInspector.View}
  * @param {!WebInspector.PopoverHelper=} popoverHelper
  */
 WebInspector.Popover = function(popoverHelper)
 {
     WebInspector.View.call(this);
     this.markAsRoot();
     this.element.className = "popover custom-popup-vertical-scroll custom-popup-horizontal-scroll"; // Override
     this._containerElement = document.createElementWithClass("div", "fill popover-container");
 
-    this._popupArrowElement = document.createElement("div");
-    this._popupArrowElement.className = "arrow";
-    this.element.appendChild(this._popupArrowElement);
-
-    this._contentDiv = document.createElement("div");
-    this._contentDiv.className = "content";
-    this.element.appendChild(this._contentDiv);
+    this._popupArrowElement = this.element.createChild("div", "arrow");
+    this._contentDiv = this.element.createChild("div", "content");
 
     this._popoverHelper = popoverHelper;
     this._hideBound = this.hide.bind(this);
 }
 
 WebInspector.Popover.prototype = {
     /**
      * @param {!Element} element
      * @param {!Element|!AnchorBox} anchor
      * @param {?number=} preferredWidth
@@ skipping 332 matching lines @@
             this._resetHoverTimer();
         }
     }
 }
 
 /** @enum {string} */
 WebInspector.Popover.Orientation = {
     Top: "top",
     Bottom: "bottom"
 }