Drop Element::isHTMLFrameElementBase() virtual function

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 5a64465f68bcfa03fcd3294d24c9b534b26d7472..e0301a0034d9d5e7edd6564342e4facd19597c63 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -1745,10 +1745,7 @@ bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTa
 
 static bool targetIsFrame(Node* target, LocalFrame*& frame)
 {
-    if (!target)
-        return false;
-
-    if (!isHTMLFrameElement(*target) && !isHTMLIFrameElement(*target))
+    if (!isHTMLFrameElementBase(target))
         return false;
 
     frame = toHTMLFrameElementBase(target)->contentFrame();