Cleanup <static_cast>: Switch to toFoo for Accessibility Objects.

Source/core/accessibility/AccessibilityMenuListPopup.h

Index: Source/core/accessibility/AccessibilityMenuListPopup.h
diff --git a/Source/core/accessibility/AccessibilityMenuListPopup.h b/Source/core/accessibility/AccessibilityMenuListPopup.h
index 1f53a0f6a351c5e8f68a495c6bd01931991009f8..acb4f4015b5836ef4130043870c49edbd719a2fd 100644
--- a/Source/core/accessibility/AccessibilityMenuListPopup.h
+++ b/Source/core/accessibility/AccessibilityMenuListPopup.h
@@ -44,7 +44,6 @@ public:
 
     void didUpdateActiveOption(int optionIndex);
 
-
 private:
     AccessibilityMenuListPopup();
 
@@ -62,6 +61,21 @@ private:
     AccessibilityMenuListOption* menuListOptionAccessibilityObject(HTMLElement*) const;
 };
 
+inline AccessibilityMenuListPopup* toAccessibilityMenuListPopup(AccessibilityObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isMenuListPopup());
+    return static_cast<AccessibilityMenuListPopup*>(object);
+}
+
+inline const AccessibilityMenuListPopup* toAccessibilityMenuListPopup(const AccessibilityObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isMenuListPopup());
+    return static_cast<const AccessibilityMenuListPopup*>(object);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toAccessibilityMenuListPopup(const AccessibilityMenuListPopup*);
+
 } // namespace WebCore
 
 #endif // AccessibilityMenuListPopup_h