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This only changes the base::Value API usage to the new style, and avoids
changing functions signatures, except for private helper functions.

Bug: 646113
Change-Id: I5dcd6d5c7df7dd185f7fc84d4563da82394fca9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089438
Commit-Queue: Anand Mistry <amistry@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749038}