Drop Element::isHTMLFrameElementBase() virtual function

Source/core/html/HTMLFrameElementBase.h

Index: Source/core/html/HTMLFrameElementBase.h
diff --git a/Source/core/html/HTMLFrameElementBase.h b/Source/core/html/HTMLFrameElementBase.h
index 82c501362baa4697a01ebdf9a64c9c42fb903451..c774006c4c6f737be3dcd2516c1e11dd2a37968b 100644
--- a/Source/core/html/HTMLFrameElementBase.h
+++ b/Source/core/html/HTMLFrameElementBase.h
@@ -61,8 +61,6 @@ private:
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE FINAL;
     virtual bool isHTMLContentAttribute(const Attribute&) const OVERRIDE FINAL;
 
-    virtual bool isFrameElementBase() const OVERRIDE FINAL { return true; }
-
     virtual bool areAuthorShadowsAllowed() const OVERRIDE FINAL { return false; }
 
     void setNameAndOpenURL();
@@ -79,7 +77,12 @@ private:
 
 inline bool isHTMLFrameElementBase(const Node& node)
 {
-    return node.isElementNode() && toElement(node).isFrameElementBase();
+    return isHTMLFrameElement(node) || isHTMLIFrameElement(node);
+}
+
+inline bool isHTMLFrameElementBase(const Node* node)
+{
+    return node && isHTMLFrameElementBase(*node);
 }
 
 DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLFrameElementBase);