Remove SiblingRuleHelper

Source/core/css/resolver/SharedStyleFinder.cpp

Index: Source/core/css/resolver/SharedStyleFinder.cpp
diff --git a/Source/core/css/resolver/SharedStyleFinder.cpp b/Source/core/css/resolver/SharedStyleFinder.cpp
index bcb46b41942a93240fe1baae9a582f87b5d375de..0bfdbf4c5914841bdfd785f91b6bfacd77f5162a 100644
--- a/Source/core/css/resolver/SharedStyleFinder.cpp
+++ b/Source/core/css/resolver/SharedStyleFinder.cpp
@@ -40,7 +40,6 @@
 #include "core/dom/Node.h"
 #include "core/dom/NodeRenderStyle.h"
 #include "core/dom/QualifiedName.h"
-#include "core/dom/SiblingRuleHelper.h"
 #include "core/dom/SpaceSplitString.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/InsertionPoint.h"
@@ -332,7 +331,7 @@ RenderStyle* SharedStyleFinder::findSharedStyle()
     }
 
     // Tracking child index requires unique style for each node. This may get set by the sibling rule match above.
-    if (!SiblingRuleHelper(element().parentElementOrShadowRoot()).childrenSupportStyleSharing()) {
+    if (!element().parentElementOrShadowRoot()->childrenSupportStyleSharing()) {
         INCREMENT_STYLE_STATS_COUNTER(m_styleResolver, sharedStyleRejectedByParent);
         return 0;
     }