Fix missing brace + incorrect nesting in cq.cfg.

try_job can't be repeated, but buckets can. I think this does what
Ryan intended.

Also add a presubmit so this doesn't happen again.

No-try because CQ is broken, and even if it weren't nothing
would catch errors in cq.cfq directly.

No-try: True
Tbr: fbarchard@chromium.org
Bug: 869249
Change-Id: If84685f93275f5af691fc3fef77881156930b726
Reviewed-on: https://chromium-review.googlesource.com/1169820
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: Patrik Höglund <phoglund@chromium.org>

infra/config/PRESUBMIT.py

+# Copyright 2018 The LibYuv Project Authors. All rights reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS. All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return input_api.canned_checks.CheckChangedLUCIConfigs(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return input_api.canned_checks.CheckChangedLUCIConfigs(input_api, output_api)

infra/config/cq.cfg

@@ -23,8 +23,6 @@ verifiers {
       builders { name: "win_clang_rel" }
       builders { name: "win_x64_clang_rel" }
     }
-
-  try_job {
     buckets {
       name: "luci.libyuv.try"
       builders { name: "win" experiment_percentage: 100 }