MD Settings: Always provide recommended meta-data

Currently we only provide recommended meta-data for prefs
when pref->IsRecommended() is true, which is only true when
the user has not set the value.

We should provide meta-data whenever a policy provides a
recommended value for a pref.

BUG=532958

Review-Url: https://codereview.chromium.org/2861393003
Cr-Commit-Position: refs/heads/master@{#472513}
3 files changed