GitLab

- Change ProtobufHttpStatus::OK, a static instance of
  ProtobufHttpStatus initialized at runtime, to OK(). Internally, OK()
  will create the instance on first use.
- Remove ProtobufHttpStatus::CANCELLED, which is only used in test code.

Bug: 537099
Change-Id: Icc7d2865e9721157cff3c5f477f4a418ab1a1b20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437734
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812039}