Revert "Replace style sharing cousin list search with LRU"

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index cea9dde5e89064f9bf45ac43e3d7d643744a9f0b..438a9d0f99b08572e9bfedee60a071caee106002 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1545,17 +1545,11 @@ void Internals::toggleOverwriteModeEnabled(Document* document, ExceptionState&)
 
 unsigned Internals::numberOfLiveNodes() const
 {
-    if (StyleResolver* resolver = contextDocument()->styleResolverIfExists())
-        resolver->clearStyleSharingList();
-
     return InspectorCounters::counterValue(InspectorCounters::NodeCounter);
 }
 
 unsigned Internals::numberOfLiveDocuments() const
 {
-    if (StyleResolver* resolver = contextDocument()->styleResolverIfExists())
-        resolver->clearStyleSharingList();
-
     return InspectorCounters::counterValue(InspectorCounters::DocumentCounter);
 }
 
@@ -1848,11 +1842,6 @@ void Internals::garbageCollectDocumentResources(Document* document, ExceptionSta
         return;
     }
 
-    if (StyleResolver* resolver = contextDocument()->styleResolverIfExists())
-        resolver->clearStyleSharingList();
-    if (StyleResolver* resolver = document->styleResolverIfExists())
-        resolver->clearStyleSharingList();
-
     ResourceFetcher* fetcher = document->fetcher();
     if (!fetcher)
         return;