As discussed, shipping early in the M48 branch will likely have greater
exposure than staging, in order to find any remaining bugs with this feature,
and provides plenty of time to unship if needed.

BUG=
LOG=N
R=adamk@chromium.org, wingo@chromium.org, rossberg@chromium.org

Review URL: https://codereview.chromium.org/1391643003

Cr-Commit-Position: refs/heads/master@{#31132}