GitLab

There will be system tray support for these coming out in future. In the meantime we don't want apps to start relying on the background mode.

BUG=163770


Review URL: https://chromiumcodereview.appspot.com/11421193

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170844 0039d316-1c4b-4281-b951-d872f2087c98