Default orientation for aria scrollbars should be vertical

Source/modules/accessibility/AXRenderObject.cpp

Index: Source/modules/accessibility/AXRenderObject.cpp
diff --git a/Source/modules/accessibility/AXRenderObject.cpp b/Source/modules/accessibility/AXRenderObject.cpp
index f262d7b35daa23ee55f6fa83987a6fff6de7a295..9f00a37b617d5f0ea1b29ecef075b92be63f7c34 100644
--- a/Source/modules/accessibility/AXRenderObject.cpp
+++ b/Source/modules/accessibility/AXRenderObject.cpp
@@ -849,6 +849,9 @@ AccessibilityOrientation AXRenderObject::orientation() const
     if (equalIgnoringCase(ariaOrientation, "vertical"))
         return AccessibilityOrientationVertical;
 
+    if (isScrollbar())
+        return AccessibilityOrientationVertical;
+
     return AXObject::orientation();
 }