GitLab

This type is not in use, and we don't plan to use this any time soon.
We should add it back when it's needed.

BUG=257916
TEST=Files.app works as before
R=benwells@chromium.org, mtomasz@chromium.org

Review URL: https://codereview.chromium.org/23956009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221982 0039d316-1c4b-4281-b951-d872f2087c98