Close NTP when launching an app (fix regression)
Close NTP when launching an app (fix regression)

BUG=51157
TEST=none

Review URL: http://codereview.chromium.org/3159017

git-svn-id: http://src.chromium.org/svn/trunk/src@56173 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 82bad9a57dbf482223b66ef1c06f73bcbdac0c39
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