Make stylesheet owner node a reference instead of pointer.

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.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 2961 matching lines @@
         m_baseURL = m_url;
 
     selectorQueryCache().invalidate();
 
     if (!m_baseURL.isValid())
         m_baseURL = KURL();
 
     if (m_elemSheet) {
         // Element sheet is silly. It never contains anything.
         DCHECK(!m_elemSheet->contents()->ruleCount());
-        m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
+        m_elemSheet = CSSStyleSheet::createInline(*this, m_baseURL);
     }
 
     if (!equalIgnoringFragmentIdentifier(oldBaseURL, m_baseURL)) {
         // Base URL change changes any relative visited links.
         // FIXME: There are other URLs in the tree that would need to be re-evaluated on dynamic base URL change. Style should be invalidated too.
         for (HTMLAnchorElement& anchor : Traversal<HTMLAnchorElement>::startsAfter(*this))
             anchor.invalidateCachedVisitedLinkHash();
     }
 }
 
@@ skipping 94 matching lines @@
 {
     if (!isScriptExecutionReady())
         return;
     if (ScriptableDocumentParser* parser = scriptableDocumentParser())
         parser->executeScriptsWaitingForResources();
 }
 
 CSSStyleSheet& Document::elementSheet()
 {
     if (!m_elemSheet)
-        m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
+        m_elemSheet = CSSStyleSheet::createInline(*this, m_baseURL);
     return *m_elemSheet;
 }
 
 void Document::maybeHandleHttpRefresh(const String& content, HttpRefreshType httpRefreshType)
 {
     if (m_isViewSource || !m_frame)
         return;
 
     double delay;
     String refreshURL;
@@ skipping 2979 matching lines @@
 }
 
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().getString().utf8().data());
 }
 #endif