GitLab

This should only show up for apps which have the appNotifications permission
in their manifest.

BUG=106268
TEST=Install an app with the appNotifications permission - the icon on the
NTP should get a 'Disable Notifications' context menu entry which if checked
will keep the notification bubbles from appearing over the app's icon.

Review URL: http://codereview.chromium.org/8785016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113111 0039d316-1c4b-4281-b951-d872f2087c98