cq.cfg: temporarily remove linux_chromium_rel_ng_patch_on_gclient.

While chrome operations are deciding how to rework how CQ deals
with buildbucket-experimental builders.

R=ehmaldonado@chromium.org, nodir@chromium.org

Bug: 828111
Change-Id: I44c10d9328763cff1bdf609d89841e5aa5aa2f0f
No-Try: True
Reviewed-on: https://chromium-review.googlesource.com/991082Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547549}

infra/config/branch/cq.cfg

@@ -29,13 +29,6 @@ verifiers {
 # chrome-eng-review per
 # https://sites.google.com/a/chromium.org/dev/developers/testing/chromium-build-infrastructure/tour-of-the-chromium-buildbot?pli=1#TOC-Adding-new-build-configurations-and-tests-to-the-main-Chromium-waterfall-Commit-Queue
   try_job {
-    buckets {
-      name: "luci.chromium.try"
-      builders {
-        name: "linux_chromium_rel_ng_patch_on_gclient"
-        experiment_percentage: 5
-      }
-    }
     buckets {
       name: "master.tryserver.chromium.android"
       builders {