Make the close_button the last child view of an infobar.
Make the close_button the last child view of an infobar.

BUG=37360
TEST=JAWS read the infobar's text before it reads the close button.

Review URL: http://codereview.chromium.org/3431027

git-svn-id: http://src.chromium.org/svn/trunk/src@60571 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 752b022d2d5c4c5b9be3968fe2ccc0135c55d777
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