Ensure that every Document has a single, distinct template content ownerDocument

Source/core/dom/Document.h

 /*
  * 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, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 996 matching lines @@
     AnimationClock& animationClock() { return *m_animationClock; }
     DocumentTimeline* timeline() const { return m_timeline.get(); }
     DocumentTimeline* transitionTimeline() const { return m_transitionTimeline.get(); }
     CSSPendingAnimations& cssPendingAnimations() { return m_cssPendingAnimations; }
 
     void addToTopLayer(Element*, const Element* before = 0);
     void removeFromTopLayer(Element*);
     const Vector<RefPtr<Element> >& topLayerElements() const { return m_topLayerElements; }
     HTMLDialogElement* activeModalDialog() const;
 
-    const Document* templateDocument() const;
+    // A non-null m_templateDocumentHost implies that |this| was created by ensureTemplateDocument().
+    bool isTemplateDocument() const { return !!m_templateDocumentHost; }
     Document& ensureTemplateDocument();
-    void setTemplateDocumentHost(Document* templateDocumentHost) { m_templateDocumentHost = templateDocumentHost; }
     Document* templateDocumentHost() { return m_templateDocumentHost; }
 
     void didAssociateFormControl(Element*);
 
     void addConsoleMessageWithRequestIdentifier(MessageSource, MessageLevel, const String& message, unsigned long requestIdentifier);
 
     virtual DOMWindow* executingWindow() OVERRIDE FINAL;
     virtual void userEventWasHandled() OVERRIDE FINAL { resetLastHandledUserGestureTimestamp(); }
     Frame* executingFrame();
 
@@ skipping 323 matching lines @@
 
     HashSet<DocumentVisibilityObserver*> m_visibilityObservers;
 };
 
 inline void Document::notifyRemovePendingSheetIfNeeded()
 {
     if (m_needsNotifyRemoveAllPendingStylesheet)
         didRemoveAllPendingStylesheet();
 }
 
-inline const Document* Document::templateDocument() const
-{
-    // If DOCUMENT does not have a browsing context, Let TEMPLATE CONTENTS OWNER be DOCUMENT and abort these steps.
-    if (!m_frame)
-        return this;
-
-    return m_templateDocument.get();
-}
-
 inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin)
 {
     // The different (legacy) meta tags have different priorities based on the type
     // regardless of which order they appear in the DOM. The priority is given by the
     // ViewportDescription::Type enum.
     return origin >= m_legacyViewportDescription.type;
 }
 
 DEFINE_TYPE_CASTS(Document, ExecutionContextClient, client, client->isDocument(), client.isDocument());
 DEFINE_TYPE_CASTS(Document, ExecutionContext, context, context->isDocument(), context.isDocument());
@@ skipping 15 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h