Destroy the GTK info bar container widget when the object is destroyed.
Destroy the GTK info bar container widget when the object is destroyed.

BUG=9802

Review URL: http://codereview.chromium.org/62104


git-svn-id: http://src.chromium.org/svn/trunk/src@13248 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 92e7234e1fd4aa13911115feaef788097d3de1d2
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