Remove ::part.

Source/core/css/RuleFeature.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 30 matching lines @@
         idsInRules.add(selector->value().impl());
     else if (selector->m_match == CSSSelector::Class)
         classesInRules.add(selector->value().impl());
     else if (selector->isAttributeSelector())
         attrsInRules.add(selector->attribute().localName().impl());
     switch (selector->pseudoType()) {
     case CSSSelector::PseudoFirstLine:
         m_usesFirstLineRules = true;
         break;
         break;
-    case CSSSelector::PseudoPart:
-        attrsInRules.add(HTMLNames::partAttr.localName().impl());
-        break;
     case CSSSelector::PseudoHost:
         collectFeaturesFromSelectorList(selector->selectorList());
         break;
     default:
         break;
     }
 }
 
 void RuleFeatureSet::collectFeaturesFromSelectorList(const CSSSelectorList* selectorList)
 {
@@ skipping 28 matching lines @@
     idsInRules.clear();
     classesInRules.clear();
     attrsInRules.clear();
     siblingRules.clear();
     uncommonAttributeRules.clear();
     m_usesFirstLineRules = false;
     m_maxDirectAdjacentSelectors = 0;
 }
 
 } // namespace WebCore