GitLab

Switch to base::JSONReader::Read() and also modernize base::Value usage
in the modified functions.

Bug: 925165
Change-Id: Ie0062059b2ab1a1c28e4bd658074d6ce9bd658ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894312
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711878}