Patch failures shouldn't be treated as infra_failures (as long as patch
was successfully downloaded).
Prior to https://crbug.com/1207685, bot_update patch failurs were set as
successful step to work around buildbucket plugin requirements.
One alternative approach is to add necessary information into patch
failure step, by editing its presentation.
R=gavinmak@google.com
Bug: 1207685, 1255228
Change-Id: I696356d40a80536c3efbca99091536b8b25deb40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3219890
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>