Adds enabling of experimental menu.
Adds enabling of experimental menu.

TBR=oshima@chromium.org
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2376002

git-svn-id: http://src.chromium.org/svn/trunk/src@48540 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6dce1b362169aa91b56f0795d3f3e6f62759b3f4
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