Move m_shouldOnlyIncludeDirectChildren member from LiveNodeListBase to HTMLCollection

Source/core/html/HTMLCollection.h

Index: Source/core/html/HTMLCollection.h
diff --git a/Source/core/html/HTMLCollection.h b/Source/core/html/HTMLCollection.h
index 5cf0419d4ba1eeb2845e5ec269067beb4299c5a8..51bced48182d8cef0529ea15b1dafc1730ccb6e9 100644
--- a/Source/core/html/HTMLCollection.h
+++ b/Source/core/html/HTMLCollection.h
@@ -63,6 +63,7 @@ protected:
 
     bool overridesItemAfter() const { return m_overridesItemAfter; }
     virtual Element* virtualItemAfter(Element*) const;
+    bool shouldOnlyIncludeDirectChildren() const { return m_shouldOnlyIncludeDirectChildren; }
 
     virtual void updateNameCache() const;
     bool hasNameCache() const { return m_isNameCacheValid; }
@@ -86,6 +87,7 @@ private:
     }
 
     const unsigned m_overridesItemAfter : 1;
+    const unsigned m_shouldOnlyIncludeDirectChildren : 1;
     mutable unsigned m_isNameCacheValid : 1;
     mutable NodeCacheMap m_idCache;
     mutable NodeCacheMap m_nameCache;