Have StyleResolver / StyleResolverState deal with Document references, not pointers

Source/core/html/HTMLLinkElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 582 matching lines @@
             m_resource = 0;
         }
 
         if (!m_owner->shouldLoadLink())
             return;
 
         m_loading = true;
 
         bool mediaQueryMatches = true;
         if (!m_owner->media().isEmpty()) {
-            RefPtr<RenderStyle> documentStyle = StyleResolver::styleForDocument(&document());
+            RefPtr<RenderStyle> documentStyle = StyleResolver::styleForDocument(document());
             RefPtr<MediaQuerySet> media = MediaQuerySet::create(m_owner->media());
             MediaQueryEvaluator evaluator(document().frame()->view()->mediaType(), document().frame(), documentStyle.get());
             mediaQueryMatches = evaluator.eval(media.get());
         }
 
         // Don't hold up render tree construction and script execution on stylesheets
         // that are not needed for the rendering at the moment.
         bool blocking = mediaQueryMatches && !m_owner->isAlternate();
         addPendingSheet(blocking ? Blocking : NonBlocking);
 
@@ skipping 25 matching lines @@
 void LinkStyle::ownerRemoved()
 {
     if (m_sheet)
         clearSheet();
 
     if (styleSheetIsLoading())
         removePendingSheet(RemovePendingSheetNotifyLater);
 }
 
 } // namespace WebCore