Relax missing security reviewer warning to a notify at upload.

Originally, this was selected to match the warning level of other
security owners checks. However:

- The other security owners check has been upgraded into an error at all
  times, to prevent less last-minute surprises from missing OWNERS.
- Having a warning that prompts at upload time is annoying when
  repeatedly uploading CLs for something that's still heavily in
  revision.

Bug: 801315
Change-Id: I7fb2ebc3e1f491fb4274ddb2a966fa041c419e9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3655008
Reviewed-by: Nasko Oskov <[email protected]>
Commit-Queue: Daniel Cheng <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1005079}
diff --git a/PRESUBMIT_test.py b/PRESUBMIT_test.py
index 9cbd92f..36ab26e 100755
--- a/PRESUBMIT_test.py
+++ b/PRESUBMIT_test.py
@@ -2350,7 +2350,7 @@
     # TODO(dcheng): This should be 1, but the PRESUBMIT currently opens the
     # OWNERS file in an unmockable way.
     self.assertEqual(2, len(results))
-    self.assertEqual('warning', results[0].type)
+    self.assertEqual('notify', results[0].type)
     self.assertEqual(
         'Found missing security reviewers:', results[0].message)
 
@@ -2448,7 +2448,7 @@
           if is_committing:
             self.assertEqual('error', results[0].type)
           else:
-            self.assertEqual('warning', results[0].type)
+            self.assertEqual('notify', results[0].type)
           self.assertEqual(
               'Found missing security reviewers:', results[0].message)
           self.assertEqual('error', results[1].type)