Allow the info bar close button to be focused by screen reader uses.
Allow the info bar close button to be focused by screen reader uses.

BUG=37360
TEST=Close button on infobar can be focused when using JAWS.

Review URL: http://codereview.chromium.org/3577001

git-svn-id: http://src.chromium.org/svn/trunk/src@61011 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a01771ccddcd1cd22169bd63f87aaa2376ad8ee3
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser