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This is going to get populated with a JSONFileDeserializer.

Bug: 1154901
Change-Id: I5285b3b24a4d574c311addd44e34572b9e863c8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2598004
Commit-Queue: Adam Norberg <norberg@google.com>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843868}