Make nocompile test failures tree closing.

Change-Id: Icc9d3644a5ebbbe3028bf6ee69e16431bb58af44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643858
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#845856}

infra/config/notifiers.star

@@ -65,6 +65,7 @@ TREE_CLOSING_STEPS_REGEXP = "\\b({})\\b".format("|".join([
     "gclient runhooks",
     "runhooks",
     "update",
+    "\\w*nocompile_test",
 ]))
 
 # This results in a notifier with no recipients, so nothing will actually be