DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/common/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 474 matching lines @@
             break;
 
         curElement = curWindow.frameElement;
         curWindow = curWindow.parent;
     }
 
     return elementOffset;
 }
 
 /**
- * @param {!Window} targetWindow
+ * @param {!Window=} targetWindow
  * @return {!AnchorBox}
  */
 Element.prototype.boxInWindow = function(targetWindow)
 {
     targetWindow = targetWindow || this.ownerDocument.defaultView;
 
     var anchorBox = this.offsetRelativeToWindow(window);
     anchorBox.width = Math.min(this.offsetWidth, window.innerWidth - anchorBox.x);
     anchorBox.height = Math.min(this.offsetHeight, window.innerHeight - anchorBox.y);
 
@@ skipping 167 matching lines @@
  */
 function isEnterKey(event) {
     // Check if in IME.
     return event.keyCode !== 229 && event.keyIdentifier === "Enter";
 }
 
 function consumeEvent(e)
 {
     e.consume();
 }