Clean up ShadowRootRareData, ShadowRoot and SlotAssignment

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 3369 matching lines @@
         Frame* parent = m_frame->tree().parent();
         while (parent) {
             if (!isOriginPotentiallyTrustworthy(parent->securityContext()->getSecurityOrigin(), errorMessage))
                 return false;
             parent = parent->tree().parent();
         }
     }
     return true;
 }
 
-StyleSheetList* Document::styleSheets()
+StyleSheetList& Document::styleSheets()
 {
     if (!m_styleSheetList)
         m_styleSheetList = StyleSheetList::create(this);
-    return m_styleSheetList.get();
+    return *m_styleSheetList;
 }
 
 String Document::preferredStylesheetSet() const
 {
     return m_styleEngine->preferredStylesheetSetName();
 }
 
 String Document::selectedStylesheetSet() const
 {
     return m_styleEngine->selectedStylesheetSetName();
@@ skipping 2547 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     Document::WeakDocumentSet& set = Document::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