Make RecursionData a stack-allocated variable in StyleInvalidator, since it is only

Source/core/css/invalidation/StyleInvalidator.h

Index: Source/core/css/invalidation/StyleInvalidator.h
diff --git a/Source/core/css/invalidation/StyleInvalidator.h b/Source/core/css/invalidation/StyleInvalidator.h
index 76e27ffde55fa93860ee2655adf5c0a139e3e949..829cc2b35bc28d48a96ebfc0355d44631b53c921 100644
--- a/Source/core/css/invalidation/StyleInvalidator.h
+++ b/Source/core/css/invalidation/StyleInvalidator.h
@@ -29,11 +29,6 @@ public:
     void trace(Visitor*);
 
 private:
-    bool invalidate(Element&);
-    bool invalidateChildren(Element&);
-
-    bool checkInvalidationSetsAgainstElement(Element&);
-
     struct RecursionData {
         RecursionData()
             : m_invalidateCustomPseudo(false)
@@ -57,6 +52,10 @@ private:
         bool m_treeBoundaryCrossing;
     };
 
+    bool invalidate(Element&, RecursionData&);
+    bool invalidateChildren(Element&, RecursionData&);
+    bool checkInvalidationSetsAgainstElement(Element&, RecursionData&);
+
     class RecursionCheckpoint {
     public:
         RecursionCheckpoint(RecursionData* data)
@@ -88,7 +87,6 @@ private:
     InvalidationList& ensurePendingInvalidationList(Element&);
 
     PendingInvalidationMap m_pendingInvalidationMap;
-    RecursionData m_recursionData;
 };
 
 } // namespace blink