GitLab

Rename the media-engagement feature flag to
RecordMediaEngagementScores in order to better describe what it
is doing.

BUG=None

Change-Id: I3d3ac469f6c32418396ca95884d18374ce8db1e1
Reviewed-on: https://chromium-review.googlesource.com/579196Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488369}