binding: Changes the association among global-proxy/global/window-instance (2nd attempt).

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 5296 matching lines @@
 
 HTMLCollection* Document::WindowNamedItems(const AtomicString& name) {
   return EnsureCachedCollection<WindowNameCollection>(kWindowNamedItems, name);
 }
 
 DocumentNameCollection* Document::DocumentNamedItems(const AtomicString& name) {
   return EnsureCachedCollection<DocumentNameCollection>(kDocumentNamedItems,
                                                         name);
 }
 
+LocalDOMWindow* Document::defaultView() const {
+  // The HTML spec requires to return null if the document is detached from the
+  // DOM.  However, |dom_window_| is not cleared on the detachment.  So, we need
+  // to check |frame_| to tell whether the document is attached or not.
+  return frame_ ? dom_window_ : nullptr;
+}
+
 void Document::FinishedParsing() {
   DCHECK(!GetScriptableDocumentParser() || !parser_->IsParsing());
   DCHECK(!GetScriptableDocumentParser() || ready_state_ != kLoading);
   SetParsingState(kInDOMContentLoaded);
   DocumentParserTiming::From(*this).MarkParserStop();
 
   // FIXME: DOMContentLoaded is dispatched synchronously, but this should be
   // dispatched in a queued task, see https://crbug.com/425790
   if (!document_timing_.DomContentLoadedEventStart())
     document_timing_.MarkDomContentLoadedEventStart();
@@ skipping 1318 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