https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_chromium_rel_ng/120261 is a failing tryjob on OSX, with a CL that will never pass OSX browser_tests (Parent CL: https://chromium-review.googlesource.com/c/chromium/src/+/1176725).  The tryjob is reported as passing, however, which resulted in landing a broken CL.

The initial browser_tests run failed as expected, however, the retry failed with:

test_results_uploader.PermanentError: Received HTTP status 400 loading "https://test-results.appspot.com/testfile/upload": invalid character ']' looking for beginning of value
step returned non-zero exit code: 1

This was presumably due to some (now fixed) infrastructure bug.  Strangely, the trybot considered this output to indicate a success.