Add an extra guard to replaceDocument()

Source/core/dom/DocumentInit.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, 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) 2013 Google Inc. All rights reserved.
  *
@@ skipping 52 matching lines @@
 }
 
 DocumentInit::DocumentInit(const KURL& url, LocalFrame* frame, WeakPtrWillBeRawPtr<Document> contextDocument, HTMLImportsController* importsController)
     : m_url(url)
     , m_frame(frame)
     , m_parent(parentDocument(frame))
     , m_owner(ownerDocument(frame))
     , m_contextDocument(contextDocument)
     , m_importsController(importsController)
     , m_createNewRegistrationContext(false)
+    , m_shouldReuseDefaultView(frame && frame->shouldReuseDefaultView(url))
 {
 }
 
 DocumentInit::DocumentInit(const DocumentInit& other)
     : m_url(other.m_url)
     , m_frame(other.m_frame)
     , m_parent(other.m_parent)
     , m_owner(other.m_owner)
     , m_contextDocument(other.m_contextDocument)
     , m_importsController(other.m_importsController)
     , m_registrationContext(other.m_registrationContext)
     , m_createNewRegistrationContext(other.m_createNewRegistrationContext)
+    , m_shouldReuseDefaultView(other.m_shouldReuseDefaultView)
 {
 }
 
 DocumentInit::~DocumentInit()
 {
 }
 
 bool DocumentInit::shouldSetURL() const
 {
     LocalFrame* frame = frameForSecurityContext();
@@ skipping 61 matching lines @@
     return m_contextDocument;
 }
 
 DocumentInit DocumentInit::fromContext(WeakPtrWillBeRawPtr<Document> contextDocument, const KURL& url)
 {
     return DocumentInit(url, 0, contextDocument, 0);
 }
 
 } // namespace blink