GitLab

Linux/GTK only.

BUG=282509
TEST=ln -s fake.com-123 SingletonLock, then run Chromium, then check that [ Quit ] and [ Unlock and Relaunch ] work.

Review URL: https://chromiumcodereview.appspot.com/23506011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222159 0039d316-1c4b-4281-b951-d872f2087c98