Convert away from method JSONReader::ReadDeprecated

Replace usage to instead use JSONReader::Read that returns a
base::Optional<base::Value>.

Bug: 925165
Change-Id: I771fd8ac7ff8ef6a3d3cf77b9f27b1051e39fcb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496980
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637336}
1 file changed