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Also adds StatusOr::code() as a convenience.

Change-Id: Id54fc2f2657b0589bad5b910b78022ac8cfef502
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523541
Auto-Submit: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825545}