file_manager: Drop support for tar archive files

These archive files were supported for internal test tools,
but it should be ready to drop support for them now.

BUG=271300
TEST=none
R=mtomasz@chromium.org

Review URL: https://codereview.chromium.org/59713006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233446 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233447 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233447