Pass implementation object to supplemental classes by reference

Source/core/css/CSSFontSelector.cpp

 /*
  * Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 97 matching lines @@
     , m_fontLoader(document->fetcher())
     , m_genericFontFamilySettings(document->frame()->settings()->genericFontFamilySettings())
 {
     // FIXME: An old comment used to say there was no need to hold a reference to m_document
     // because "we are guaranteed to be destroyed before the document". But there does not
     // seem to be any such guarantee.
 
     ASSERT(m_document);
     ASSERT(m_document->frame());
     FontCache::fontCache()->addClient(this);
-    FontFaceSet::from(document)->addFontFacesToFontFaceCache(&m_fontFaceCache, this);
+    FontFaceSet::from(*document)->addFontFacesToFontFaceCache(&m_fontFaceCache, this);
 }
 
 CSSFontSelector::~CSSFontSelector()
 {
     clearDocument();
     FontCache::fontCache()->removeClient(this);
 }
 
 void CSSFontSelector::registerForInvalidationCallbacks(CSSFontSelectorClient* client)
 {
@@ skipping 87 matching lines @@
     m_fontLoader.loadPendingFonts();
 }
 
 void CSSFontSelector::updateGenericFontFamilySettings(Document& document)
 {
     ASSERT(document.settings());
     m_genericFontFamilySettings = document.settings()->genericFontFamilySettings();
 }
 
 }