GitLab

Update callers and remove deprecated base::Value API usage along the
way.

Bug: 1012811
Change-Id: Ic2094c106538cf547cb69bfecdab976e6a095674
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478683Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818674}