Introduce new API orientation() to expose aria-orientation correctly.

Source/modules/accessibility/AXScrollbar.cpp

 /*
  * Copyright (C) 2010 Apple 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 59 matching lines @@
 AccessibilityOrientation AXScrollbar::orientation() const
 {
     if (!m_scrollbar)
         return AccessibilityOrientationHorizontal;
 
     if (m_scrollbar->orientation() == HorizontalScrollbar)
         return AccessibilityOrientationHorizontal;
     if (m_scrollbar->orientation() == VerticalScrollbar)
         return AccessibilityOrientationVertical;
 
-    return AccessibilityOrientationHorizontal;
+    return AccessibilityOrientationVertical;
 }
 
 bool AXScrollbar::isEnabled() const
 {
     if (!m_scrollbar)
         return false;
     return m_scrollbar->enabled();
 }
 
 float AXScrollbar::valueForRange() const
@@ skipping 10 matching lines @@
         return;
 
     if (!m_scrollbar->scrollableArea())
         return;
 
     float newValue = value * m_scrollbar->maximum();
     m_scrollbar->scrollableArea()->scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), newValue);
 }
 
 } // namespace blink