[Oilpan]: Move CSSFontSelectorClient to the oilpan heap using transition types.

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
  * 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.
@@ skipping 64 matching lines @@
         m_propertySet = propertySet.mutableCopy();
         return;
     }
 
     // We cannot use mergeAndOverrideOnConflict() here because it doesn't
     // respect the !important declaration (but addParsedProperty() does).
     for (unsigned i = 0; i < propertyCount; ++i)
         m_propertySet->addParsedProperty(propertySet.propertyAt(i).toCSSProperty());
 }
 
-void ViewportStyleResolver::clearDocument()
-{
-    m_document = 0;
-}
-
 void ViewportStyleResolver::resolve()
 {
     if (!m_document)
         return;
 
     if (!m_propertySet || (!m_hasAuthorStyle && m_document->hasLegacyViewportTag())) {
         ASSERT(!m_hasAuthorStyle);
         m_propertySet = nullptr;
         m_document->setViewportDescription(ViewportDescription());
         return;
@@ skipping 103 matching lines @@
 
     return result;
 }
 
 void ViewportStyleResolver::trace(Visitor* visitor)
 {
     visitor->trace(m_propertySet);
 }
 
 } // namespace WebCore