Check whether aria-expanded attribute is defined

Source/core/accessibility/AXNodeObject.h

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 95 matching lines @@
     virtual bool isNativeTextControl() const override final;
     virtual bool isNonNativeTextControl() const override final;
     virtual bool isPasswordField() const override final;
     virtual bool isProgressIndicator() const override;
     virtual bool isSlider() const override;
 
     // Check object state.
     virtual bool isChecked() const override final;
     virtual bool isClickable() const override final;
     virtual bool isEnabled() const override;
-    virtual bool isExpanded() const override final;
+    virtual AccessibilityExpanded isExpanded() const override;
     virtual bool isIndeterminate() const override final;
     virtual bool isPressed() const override final;
     virtual bool isReadOnly() const override;
     virtual bool isRequired() const override final;
 
     // Check whether certain properties can be modified.
     virtual bool canSetFocusAttribute() const override;
     virtual bool canSetValueAttribute() const override;
 
     // Properties of static elements.
@@ skipping 67 matching lines @@
     void ariaLabeledByText(Vector<AccessibilityText>&) const;
     void changeValueByPercent(float percentChange);
     float stepValueForRange() const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXNodeObject, isAXNodeObject());
 
 } // namespace blink
 
 #endif // AXNodeObject_h