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

Source/core/accessibility/AccessibilityMenuListPopup.cpp

Index: Source/core/accessibility/AccessibilityMenuListPopup.cpp
diff --git a/Source/core/accessibility/AccessibilityMenuListPopup.cpp b/Source/core/accessibility/AccessibilityMenuListPopup.cpp
index 53fe8fdbcc1c63a5699f6ade9be0a3aa971f0f05..836959ea84d29838718a3a4652bb1f5c9280b58f 100644
--- a/Source/core/accessibility/AccessibilityMenuListPopup.cpp
+++ b/Source/core/accessibility/AccessibilityMenuListPopup.cpp
@@ -72,7 +72,7 @@ AccessibilityMenuListOption* AccessibilityMenuListPopup::menuListOptionAccessibi
     AccessibilityObject* object = document()->axObjectCache()->getOrCreate(MenuListOptionRole);
     ASSERT_WITH_SECURITY_IMPLICATION(object->isMenuListOption());
 
-    AccessibilityMenuListOption* option = static_cast<AccessibilityMenuListOption*>(object);
+    AccessibilityMenuListOption* option = toAccessibilityMenuListOption(object);
     option->setElement(element);
 
     return option;