Fire AX notifications on list box options.

Source/modules/accessibility/AXObject.h

Index: Source/modules/accessibility/AXObject.h
diff --git a/Source/modules/accessibility/AXObject.h b/Source/modules/accessibility/AXObject.h
index e00d458144127ff9ad748be01800fab8dd39117a..c261efcddecbe0854c651864c7c92d2cd21548fd 100644
--- a/Source/modules/accessibility/AXObject.h
+++ b/Source/modules/accessibility/AXObject.h
@@ -335,6 +335,8 @@ public:
     // Determine subclass type.
     virtual bool isAXNodeObject() const { return false; }
     virtual bool isAXLayoutObject() const { return false; }
+    virtual bool isAXListBox() const { return false; }
+    virtual bool isAXListBoxOption() const { return false; }
     virtual bool isAXScrollbar() const { return false; }
     virtual bool isAXScrollView() const { return false; }
     virtual bool isAXSVGRoot() const { return false; }
@@ -364,7 +366,6 @@ public:
     virtual bool isLink() const { return false; }
     virtual bool isList() const { return false; }
     bool isListItem() const { return roleValue() == ListItemRole; }
-    virtual bool isListBoxOption() const { return false; }
     virtual bool isMenu() const { return false; }
     virtual bool isMenuButton() const { return false; }
     virtual bool isMenuList() const { return false; }