Remove AtomicStringImpl.

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 223 matching lines @@
             }
         } else if (!foundSiblingSelector && selector->isSiblingSelector())
             foundSiblingSelector = true;
     }
     if (foundSiblingSelector)
         features.siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
     if (ruleData.containsUncommonAttributeSelector())
         features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
 }
     
-void RuleSet::addToRuleSet(AtomicStringImpl* key, PendingRuleMap& map, const RuleData& ruleData)
+void RuleSet::addToRuleSet(StringImpl* key, PendingRuleMap& map, const RuleData& ruleData)
 {
     if (!key)
         return;
     OwnPtr<LinkedStack<RuleData> >& rules = map.add(key, nullptr).iterator->value;
     if (!rules)
         rules = adoptPtr(new LinkedStack<RuleData>);
     rules->push(ruleData);
 }
 
 bool RuleSet::findBestRuleSetAndAdd(const CSSSelector* component, RuleData& ruleData)
@@ skipping 198 matching lines @@
     compactPendingRules(pendingRules->shadowPseudoElementRules, m_shadowPseudoElementRules);
     m_linkPseudoClassRules.shrinkToFit();
     m_cuePseudoRules.shrinkToFit();
     m_focusPseudoClassRules.shrinkToFit();
     m_universalRules.shrinkToFit();
     m_pageRules.shrinkToFit();
     m_viewportRules.shrinkToFit();
 }
 
 } // namespace WebCore