GitLab

... Since there is no longer need for it to implement
HttpUserAgentSettings anymore, just to provide some functions related to
the language pref.

Change-Id: I5afffca7f918e395df874ebddbffa970f2320d5f
Reviewed-on: https://chromium-review.googlesource.com/965936
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543750}