Remove ::part.

Source/core/css/RuleSet.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 242 matching lines @@
 {
     if (component->m_match == CSSSelector::Id) {
         addToRuleSet(component->value().impl(), ensurePendingRules()->idRules, ruleData);
         return true;
     }
     if (component->m_match == CSSSelector::Class) {
         addToRuleSet(component->value().impl(), ensurePendingRules()->classRules, ruleData);
         return true;
     }
     if (component->isCustomPseudoElement()) {
-        StringImpl* pseudoValue = component->pseudoType() == CSSSelector::PseudoPart ? component->argument().impl() : component->value().impl();
-        addToRuleSet(pseudoValue, ensurePendingRules()->shadowPseudoElementRules, ruleData);
+        addToRuleSet(component->value().impl(), ensurePendingRules()->shadowPseudoElementRules, ruleData);
         return true;
     }
     if (component->pseudoType() == CSSSelector::PseudoCue) {
         m_cuePseudoRules.append(ruleData);
         return true;
     }
     if (SelectorChecker::isCommonPseudoClassSelector(component)) {
         switch (component->pseudoType()) {
         case CSSSelector::PseudoLink:
         case CSSSelector::PseudoVisited:
@@ skipping 183 matching lines @@
     m_pageRules.shrinkToFit();
     m_viewportRules.shrinkToFit();
     m_fontFaceRules.shrinkToFit();
     m_keyframesRules.shrinkToFit();
     m_hostRules.shrinkToFit();
     m_treeBoundaryCrossingRules.shrinkToFit();
     m_shadowDistributedRules.shrinkToFit();
 }
 
 } // namespace WebCore