HTML Imports: Let document.defaultView null for imports.

Source/core/dom/Document.idl

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 62 matching lines @@
 
     [RaisesException, TypeChecking=Interface] NodeIterator createNodeIterator(Node root,
                                                                               optional unsigned long whatToShow = 0xFFFFFFFF,
                                                                               optional NodeFilter? filter = null);
     [RaisesException, TypeChecking=Interface] TreeWalker createTreeWalker(Node root,
                                                                           optional unsigned long whatToShow = 0xFFFFFFFF,
                                                                           optional NodeFilter? filter = null);
 
     // DOM Level 2 Abstract Views (DocumentView interface)
 
-    [ImplementedAs=executingWindow] readonly attribute Window defaultView;
+    [ImplementedAs=domWindow] readonly attribute Window defaultView;
 
     // DOM Level 2 Style (DocumentStyle interface)
 
     readonly attribute StyleSheetList styleSheets;
 
     // DOM Level 2 Style (DocumentCSS interface)
 
     CSSStyleDeclaration getOverrideStyle([Default=Undefined] optional Element element,
                                          [Default=Undefined] optional DOMString pseudoElement);
 
@@ skipping 122 matching lines @@
     // TODO(davidben): This is a property so attaching a deprecation warning results in false positives when outputting
     // document in the console. It's possible http://crbug.com/43394 will resolve this.
     [MeasureAs=PrefixedPageVisibility, ImplementedAs=visibilityState] readonly attribute DOMString webkitVisibilityState;
     [MeasureAs=PrefixedPageVisibility, ImplementedAs=hidden] readonly attribute boolean webkitHidden;
 
     readonly attribute HTMLScriptElement currentScript;
 };
 
 Document implements GlobalEventHandlers;
 Document implements ParentNode;