CQ: add landmines to delete database after unclean shutdown

This is an improved version of https://codereview.chromium.org/23011039/
using an approach recommended by Isaac.

I've tested it locally (thanks to recently committed changes),
and it behaves as expected and doesn't break any other things.

BUG=239272
[email protected]

Review URL: https://codereview.chromium.org/24434003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/commit-queue@225276 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed