completion_stages: do not throttle tree on canary failures

BUG=chromium:584129
TEST=None

Change-Id: Ib2ffb1637c4305f5315b4154a8a20f7f799ee68a
Reviewed-on: https://chromium-review.googlesource.com/325821
Trybot-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
1 file changed