Default orientation for aria scrollbars should be vertical

Source/modules/accessibility/AXRenderObject.cpp

 /*
 * Copyright (C) 2008 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 831 matching lines @@
 }
 
 AccessibilityOrientation AXRenderObject::orientation() const
 {
     const AtomicString& ariaOrientation = getAttribute(aria_orientationAttr);
     if (equalIgnoringCase(ariaOrientation, "horizontal"))
         return AccessibilityOrientationHorizontal;
     if (equalIgnoringCase(ariaOrientation, "vertical"))
         return AccessibilityOrientationVertical;
 
+    if (isScrollbar())
+        return AccessibilityOrientationVertical;
+
     return AXObject::orientation();
 }
 
 String AXRenderObject::text() const
 {
     if (isPasswordFieldAndShouldHideValue())
         return String();
 
     return AXNodeObject::text();
 }
@@ skipping 1575 matching lines @@
         if (label && label->renderer()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink