The name attribute can be from contents for listitem role
according to http://www.w3.org/WAI/PF/aria/roles#listitem.

BUG=347865

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184795

Review URL: https://codereview.chromium.org/696953002

git-svn-id: svn://svn.chromium.org/blink/trunk@185092 bbb929c8-8fbe-4397-9dbb-9b2b20218538