Consistently use on-heap collections for StyleRuleBase descendants.

Source/core/dom/StyleEngine.h

 /*
  * 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) 2011 Google Inc. All rights reserved.
  *
@@ skipping 151 matching lines @@
             m_resolver->appendPendingAuthorStyleSheets();
         }
         return *m_resolver.get();
     }
 
     bool hasResolver() const { return m_resolver.get(); }
     void clearResolver();
     void clearMasterResolver();
 
     CSSFontSelector* fontSelector() { return m_fontSelector.get(); }
-    void removeFontFaceRules(const Vector<const StyleRuleFontFace*>&);
+    void removeFontFaceRules(const WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> >&);
     void clearFontCache();
     // updateGenericFontFamilySettings is used from WebSettingsImpl.
     void updateGenericFontFamilySettings();
 
     void didDetach();
     bool shouldClearResolver() const;
     StyleResolverChange resolverChanged(RecalcStyleTime, StyleResolverUpdateMode);
     unsigned resolverAccessCount() const;
 
     void markDocumentDirty();
@@ skipping 58 matching lines @@
     bool m_ignorePendingStylesheets;
     bool m_didCalculateResolver;
     OwnPtr<StyleResolver> m_resolver;
 
     RefPtr<CSSFontSelector> m_fontSelector;
 };
 
 }
 
 #endif