GitLab

This will simplify the task of changing WebLayer to take advantage of
the newly-componentized ContentMetricsHelper in a followup CL.

Bug: 1030692
Change-Id: Iad9d8e557b73837ffd9c4506cec4ed63424b63cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041626
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739104}