binding: Changes the association among global-proxy/global/window-instance.

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 5193 matching lines @@
 
 HTMLCollection* Document::windowNamedItems(const AtomicString& name) {
   return ensureCachedCollection<WindowNameCollection>(WindowNamedItems, name);
 }
 
 DocumentNameCollection* Document::documentNamedItems(const AtomicString& name) {
   return ensureCachedCollection<DocumentNameCollection>(DocumentNamedItems,
                                                         name);
 }
 
+LocalDOMWindow* Document::defaultView() const {
+  // The HTML spec requires to return null if the document is detached from a
+  // frame.  However, |m_domWindow| is not cleared on the detachment.  So, we
+  // need to check |m_frame| to tell whether the document is attached or not.
+  return m_frame ? m_domWindow : nullptr;
+}
+
 void Document::finishedParsing() {
   DCHECK(!scriptableDocumentParser() || !m_parser->isParsing());
   DCHECK(!scriptableDocumentParser() || m_readyState != Loading);
   setParsingState(InDOMContentLoaded);
   DocumentParserTiming::from(*this).markParserStop();
 
   // FIXME: DOMContentLoaded is dispatched synchronously, but this should be
   // dispatched in a queued task, see https://crbug.com/425790
   if (!m_documentTiming.domContentLoadedEventStart())
     m_documentTiming.markDomContentLoadedEventStart();
@@ skipping 1356 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif