Use the HashSet of attribute names in SharedStyleFinder.

sky/engine/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 138 matching lines @@
         addToRuleSet(tagName, ensurePendingRules()->tagRules, ruleData);
         return true;
     }
 
     return false;
 }
 
 void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, AddRuleFlags addRuleFlags)
 {
     RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags);
-    m_features.collectFeaturesFromRuleData(ruleData);
+    m_features.collectFeaturesFromSelector(ruleData.selector());
 
     if (!findBestRuleSetAndAdd(ruleData.selector(), ruleData)) {
         // If we didn't find a specialized map to stick it in, file under universal rules.
         m_universalRules.append(ruleData);
     }
 }
 
 void RuleSet::addFontFaceRule(StyleRuleFontFace* rule)
 {
     ensurePendingRules(); // So that m_fontFaceRules.shrinkToFit() gets called.
@@ skipping 78 matching lines @@
 
 #ifndef NDEBUG
 void RuleSet::show()
 {
     for (Vector<RuleData>::const_iterator it = m_allRules.begin(); it != m_allRules.end(); ++it)
         it->selector().show();
 }
 #endif
 
 } // namespace blink