infra: revert win_chromium_compile_dbg_ng RBE migration.

Still experiencing a lot of infra failures after crrev.com/c/1967566.

Bug: 950413
No-Try: true
Tbr: bpastene@chromium.org,agable@chromium.org
Change-Id: Id539191c5540fd9944ce368572ddb3d9c722f7c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967878Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Auto-Submit: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724808}

infra/config/buckets/try.star

@@ -1576,6 +1576,8 @@ win_builder(
 
 win_builder(
     name = 'win_chromium_compile_dbg_ng',
+    goma_backend = None,
+    goma_enable_ats = False,
     goma_jobs = goma.jobs.J150,
     tryjob = tryjob(),
 )

infra/config/generated/cr-buildbucket.cfg

@@ -18012,7 +18012,7 @@ buckets: <
         name: "chromium_trybot"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
-        properties_j: "$build/goma:{\"enable_ats\":true,\"jobs\":150,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
+        properties_j: "$build/goma:{\"jobs\":150}"
         properties_j: "$kitchen:{\"devshell\":true,\"git_auth\":true}"
         properties_j: "mastername:\"tryserver.chromium.win\""
       >