Rename StyleSheetCollections to StyleEngine.

Source/core/css/DocumentRuleSets.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 20 matching lines @@
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class CSSStyleRule;
 class CSSStyleSheet;
 class InspectorCSSOMWrappers;
 class MatchRequest;
 class MediaQueryEvaluator;
 class RuleSet;
-class StyleSheetCollections;
+class StyleEngine;
 
 class ShadowDistributedRules {
 public:
     void addRule(StyleRule*, size_t selectorIndex, ContainerNode* scopingNode, AddRuleFlags);
     void collectMatchRequests(bool includeEmptyRules, Vector<MatchRequest>&);
     void clear() { m_shadowDistributedRuleSetMap.clear(); }
     void reset(const ContainerNode* scopingNode);
     bool isEmpty() const { return m_shadowDistributedRuleSetMap.isEmpty(); }
     void collectFeaturesTo(RuleFeatureSet&);
 
 private:
     typedef HashMap<const ContainerNode*, OwnPtr<RuleSet> > ShadowDistributedRuleSetMap;
     ShadowDistributedRuleSetMap m_shadowDistributedRuleSetMap;
 };
 
 class DocumentRuleSets {
 public:
     DocumentRuleSets();
     ~DocumentRuleSets();
     RuleSet* userStyle() const { return m_userStyle.get(); }
 
-    void initUserStyle(StyleSheetCollections*, const MediaQueryEvaluator&, StyleResolver&);
+    void initUserStyle(StyleEngine*, const MediaQueryEvaluator&, StyleResolver&);
     void resetAuthorStyle();
     void collectFeaturesTo(RuleFeatureSet&, bool isViewSource);
 
     ShadowDistributedRules& shadowDistributedRules() { return m_shadowDistributedRules; }
 
 private:
     void collectRulesFromUserStyleSheets(const Vector<RefPtr<CSSStyleSheet> >&, RuleSet& userStyle, const MediaQueryEvaluator&, StyleResolver&);
     OwnPtr<RuleSet> m_userStyle;
     ShadowDistributedRules m_shadowDistributedRules;
 };
 
 } // namespace WebCore
 
 #endif // DocumentRuleSets_h