DevTools: move DOMExtension.js into ui module.

third_party/WebKit/Source/devtools/front_end/ui/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 794 matching lines @@
   return event.keyCode !== 229 && event.key === 'Enter';
 }
 
 /**
  * @param {!Event} event
  * @return {boolean}
  */
 function isEscKey(event) {
   return event.keyCode === 27;
 }
-
-/**
- * @param {function()} callback
- * @suppressGlobalPropertiesCheck
- */
-function runOnWindowLoad(callback) {
-  /**
-   * @suppressGlobalPropertiesCheck
-   */
-  function windowLoaded() {
-    window.removeEventListener('DOMContentLoaded', windowLoaded, false);
-    callback();
-  }
-
-  if (document.readyState === 'complete' || document.readyState === 'interactive')
-    callback();
-  else
-    window.addEventListener('DOMContentLoaded', windowLoaded, false);
-}