Remove all members in ScopedStyleTree for preparing class removal

Source/core/dom/StyleEngine.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 468 matching lines @@
 
     m_resolver = adoptPtrWillBeNoop(new StyleResolver(*m_document));
     appendActiveAuthorStyleSheets();
     combineCSSFeatureFlags(m_resolver->ensureUpdatedRuleFeatureSet());
 }
 
 void StyleEngine::clearResolver()
 {
     ASSERT(!document().inStyleRecalc());
     ASSERT(isMaster() || !m_resolver);
+
+    m_document->clearScopedStyleResolver();
+    for (StyleSheetCollectionMap::iterator it = m_styleSheetCollectionMap.begin(); it != m_styleSheetCollectionMap.end(); ++it)
+        it->key->clearScopedStyleResolver();
+
     if (m_resolver)
         document().updateStyleInvalidationIfNeeded();
     m_resolver.clear();
 }
 
 void StyleEngine::clearMasterResolver()
 {
     if (Document* master = this->master())
         master->styleEngine()->clearResolver();
 }
@@ skipping 186 matching lines @@
     visitor->trace(m_resolver);
     visitor->trace(m_fontSelector);
     visitor->trace(m_textToSheetCache);
     visitor->trace(m_sheetToTextCache);
     visitor->trace(m_xslStyleSheet);
 #endif
     CSSFontSelectorClient::trace(visitor);
 }
 
 }