Implements determineAccessibilityRole() instead of roleValue()

Source/modules/accessibility/AXMenuList.cpp

Index: Source/modules/accessibility/AXMenuList.cpp
diff --git a/Source/modules/accessibility/AXMenuList.cpp b/Source/modules/accessibility/AXMenuList.cpp
index f21b0f6f5b083b96af8c27e1257e7432f9a90ec6..cc9f19efffd68ff55ac11bb5ea4e7bb93294803c 100644
--- a/Source/modules/accessibility/AXMenuList.cpp
+++ b/Source/modules/accessibility/AXMenuList.cpp
@@ -42,11 +42,11 @@ PassRefPtr<AXMenuList> AXMenuList::create(LayoutMenuList* layoutObject, AXObject
     return adoptRef(new AXMenuList(layoutObject, axObjectCache));
 }
 
-AccessibilityRole AXMenuList::roleValue() const
+AccessibilityRole AXMenuList::determineAccessibilityRole()
 {
-    AccessibilityRole ariaRole = ariaRoleAttribute();
-    if (ariaRole != UnknownRole)
-        return ariaRole;
+    if ((m_ariaRole = determineAriaRoleAttribute()) != UnknownRole)
+        return m_ariaRole;
+
     return PopUpButtonRole;
 }