Popular sites on the NTP: upgrade default file version to 3
Popular sites on the NTP: upgrade default file version to 3

BUG=516618

Review URL: https://codereview.chromium.org/1427463002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#356038}

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