Revert "Replace style sharing cousin list search with LRU"

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 8070d0f3f27dcb6bf90161060a91d33191d56498..9c2ca3bd53eb7443a49c835d48201efd1094c96c 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -243,18 +243,6 @@ void StyleResolver::collectFeatures()
     m_uncommonAttributeRuleSet = makeRuleSet(m_features.uncommonAttributeRules);
 }
 
-void StyleResolver::addToStyleSharingList(Element* element)
-{
-    if (m_styleSharingList.size() >= styleSharingListSize)
-        m_styleSharingList.remove(--m_styleSharingList.end());
-    m_styleSharingList.prepend(element);
-}
-
-void StyleResolver::clearStyleSharingList()
-{
-    m_styleSharingList.clear();
-}
-
 void StyleResolver::pushParentElement(Element* parent)
 {
     const ContainerNode* parentsParent = parent->parentOrShadowHostElement();