Simplify the style sharing list code.

sky/engine/core/css/resolver/StyleResolver.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.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 47 matching lines @@
 class Settings;
 class StyleKeyframe;
 class StylePropertySet;
 class StyleResolverStats;
 class StyleRule;
 class StyleRuleKeyframes;
 
 class MatchResult;
 
 const unsigned styleSharingListSize = 15;
-const unsigned styleSharingMaxDepth = 32;
-typedef Deque<RawPtr<Element>, styleSharingListSize> StyleSharingList;
+typedef Deque<Element*, styleSharingListSize> StyleSharingList;
 
 struct CSSPropertyValue {
     STACK_ALLOCATED();
 public:
     CSSPropertyValue(CSSPropertyID property, CSSValue* value)
         : property(property), value(value) { }
     // Stores value=propertySet.getPropertyCSSValue(id).get().
     CSSPropertyValue(CSSPropertyID, const StylePropertySet&);
     CSSPropertyID property;
     RawPtr<CSSValue> value;
@@ skipping 39 matching lines @@
     void applyPropertiesToStyle(const CSSPropertyValue* properties, size_t count, RenderStyle*);
 
     void addMediaQueryResults(const MediaQueryResultList&);
     bool mediaQueryAffectedByViewportChange() const;
 
     // FIXME: Rename to reflect the purpose, like didChangeFontSize or something.
     void invalidateMatchedPropertiesCache();
 
     void notifyResizeForViewportUnits();
 
-    StyleSharingList& styleSharingList();
+    StyleSharingList& styleSharingList() { return m_styleSharingList; }
 
     void addToStyleSharingList(Element&);
     void clearStyleSharingList();
 
     StyleResolverStats* stats() { return m_styleResolverStats.get(); }
     StyleResolverStats* statsTotals() { return m_styleResolverStatsTotals.get(); }
     enum StatsReportType { ReportDefaultStats, ReportSlowStats };
     void enableStats(StatsReportType = ReportDefaultStats);
     void disableStats();
     void printStats();
 
     unsigned accessCount() const { return m_accessCount; }
     void didAccess() { ++m_accessCount; }
 
-    void increaseStyleSharingDepth() { ++m_styleSharingDepth; }
-    void decreaseStyleSharingDepth() { --m_styleSharingDepth; }
-
 private:
     // FIXME: This should probably go away, folded into FontBuilder.
     void updateFont(StyleResolverState&);
 
     void loadPendingResources(StyleResolverState&);
 
     void appendCSSStyleSheet(CSSStyleSheet*);
 
     void matchAuthorRules(Element*, ElementRuleCollector&);
     void matchAllRules(StyleResolverState&, ElementRuleCollector&);
@@ skipping 27 matching lines @@
     MediaQueryResultList m_viewportDependentMediaQueryResults;
 
     RawPtr<Document> m_document;
 
     ListHashSet<RawPtr<CSSStyleSheet>, 16> m_pendingStyleSheets;
 
     bool m_printMediaType;
 
     StyleResourceLoader m_styleResourceLoader;
 
-    unsigned m_styleSharingDepth;
-    Vector<OwnPtr<StyleSharingList>, styleSharingMaxDepth> m_styleSharingLists;
+    StyleSharingList m_styleSharingList;
 
     OwnPtr<StyleResolverStats> m_styleResolverStats;
     OwnPtr<StyleResolverStats> m_styleResolverStatsTotals;
     unsigned m_styleResolverStatsSequence;
 
     // Use only for Internals::updateStyleAndReturnAffectedElementCount.
     unsigned m_accessCount;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_CSS_RESOLVER_STYLERESOLVER_H_