Use celes-pre-cq instead of strago-pre-cq

The strago build is not well kept after, as it is not used in production;
celes, however, is.

BUG=chromium:734103
TEST=None

Change-Id: I0ecd448a2efb030c1ad3658d2e7ec531b2a44929
Reviewed-on: https://chromium-review.googlesource.com/540275
Commit-Ready: Bernie Thompson <bhthompson@chromium.org>
Tested-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@google.com>
1 file changed