Revert "Replace style sharing cousin list search with LRU"

Source/core/css/resolver/StyleResolver.h

Index: Source/core/css/resolver/StyleResolver.h
diff --git a/Source/core/css/resolver/StyleResolver.h b/Source/core/css/resolver/StyleResolver.h
index 9340f678abeebe18fdf6a1a29656ec2714e48071..2a78cb7be7c4babb3ee4a4d7ecd6fcce08b3ac16 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -36,7 +36,6 @@
 #include "core/css/resolver/StyleBuilder.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "core/css/resolver/StyleResourceLoader.h"
-#include "wtf/Deque.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/RefPtr.h"
@@ -86,9 +85,6 @@ enum RuleMatchingBehavior {
     MatchOnlyUserAgentRules,
 };
 
-const unsigned styleSharingListSize = 40;
-typedef WTF::Deque<RefPtr<Element>, styleSharingListSize> StyleSharingList;
-
 #undef STYLE_STATS
 
 #ifdef STYLE_STATS
@@ -277,11 +273,6 @@ public:
 
     const RuleFeatureSet& ruleFeatureSet() const { return m_features; }
 
-    StyleSharingList& styleSharingList() { return m_styleSharingList; }
-
-    void addToStyleSharingList(Element*);
-    void clearStyleSharingList();
-
 #ifdef STYLE_STATS
     ALWAYS_INLINE static StyleSharingStats& styleSharingStats() { return m_styleSharingStats; }
 #endif
@@ -365,8 +356,6 @@ private:
 
     StyleResourceLoader m_styleResourceLoader;
 
-    StyleSharingList m_styleSharingList;
-
 #ifdef STYLE_STATS
     static StyleSharingStats m_styleSharingStats;
 #endif