Introduce DEFINE_AX_OBJECT_TYPE_CASTS to replace manual toFoo() in accessibility child class

Source/core/accessibility/AXMenuListOption.h

Index: Source/core/accessibility/AXMenuListOption.h
diff --git a/Source/core/accessibility/AXMenuListOption.h b/Source/core/accessibility/AXMenuListOption.h
index 55845ca0b06cfd2a81ccc1249ebbbf097aa7cd6b..8c20d8d30678f49eef210cde72708529aef4018c 100644
--- a/Source/core/accessibility/AXMenuListOption.h
+++ b/Source/core/accessibility/AXMenuListOption.h
@@ -61,20 +61,7 @@ private:
     RefPtr<HTMLElement> m_element;
 };
 
-inline AXMenuListOption* toAXMenuListOption(AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isMenuListOption());
-    return static_cast<AXMenuListOption*>(object);
-}
-
-inline const AXMenuListOption* toAXMenuListOption(const AXObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isMenuListOption());
-    return static_cast<const AXMenuListOption*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toAXMenuListOption(const AXMenuListOption*);
+DEFINE_AX_OBJECT_TYPE_CASTS(AXMenuListOption, isMenuListOption());
 
 } // namespace WebCore