Add omitted reference operator of VisiblePosition in AccessibilityObject
https://bugs.webkit.org/show_bug.cgi?id=113879

Reviewed by Darin Adler.

Seems reference operator has been omitted in startOfStyleRange function, so add it.

* accessibility/AccessibilityObject.cpp:
(WebCore::startOfStyleRange):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147565 268f45cc-cd09-0410-ab3c-d52691b4dbfc