Ship the Credential Management API by default
This patch enables the Credential Management API by default.
It also converts the existing CLI flag into a `base::Feature`, which will allow
us to hook it up to Finch as a kill-switch in case it asplodes the internets.
This feature flag can be removed after ~a release, once we're confident that
we're not breaking things.
Intent to Ship: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/7ouLjWzcjb0
BUG=576705
R=vabr@chromium.org
Review URL: https://codereview.chromium.org/1720403003
Cr-Commit-Position: refs/heads/master@{#377276}
11 files changed
