DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/DOMExtension.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 134 matching lines @@
 }
 
 Element.prototype.removeMatchingStyleClasses = function(classNameRegex)
 {
     var regex = new RegExp("(^|\\s+)" + classNameRegex + "($|\\s+)");
     if (regex.test(this.className))
         this.className = this.className.replace(regex, " ");
 }
 
 /**
- * @param {string} className
- * @param {*} enable
- */
-Element.prototype.enableStyleClass = function(className, enable)
-{
-    if (enable)
-        this.classList.add(className);
-    else
-        this.classList.remove(className);
-}
-
-/**
  * @param {number|undefined} x
  * @param {number|undefined} y
  * @param {!Element=} relativeTo
  */
 Element.prototype.positionAt = function(x, y, relativeTo)
 {
     var shift = {x: 0, y: 0};
     if (relativeTo)
        shift = relativeTo.boxInWindow(this.ownerDocument.defaultView);
 
@@ skipping 397 matching lines @@
  */
 function isEnterKey(event) {
     // Check if in IME.
     return event.keyCode !== 229 && event.keyIdentifier === "Enter";
 }
 
 function consumeEvent(e)
 {
     e.consume();
 }