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This is more direct and avoids use of the legacy base::Value API, since
nothing else is done with this base::Value anyway.

Bug: 646113
Change-Id: I335ad2c355734cd8fff45be4996383f39f5bf678
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2233923
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776339}