This prevents TBR (self code-review) permissions from blocking
the CL from being uploaded at all. Instead, it will fully
upload, and then show a better error message after upload is
complete.

Bug: 729967
Change-Id: I55e3e98e200143076afcaab858064d9f5c62f8ef
Reviewed-on: https://chromium-review.googlesource.com/527325Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>