The idea here is that when one of the filters are cleaned up in Chromium,
they should not be filtered out, otherwise we won't catch them in
the presubmit step.

See for example -> https://codereview.chromium.org/788493002/

BUG=None
R=agable@chromium.org, dpranke@chromium.org

Review URL: https://codereview.chromium.org/779033003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@293357 0039d316-1c4b-4281-b951-d872f2087c98