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For example, previously if chrome.storage.sync.set was called more than 1000
times in an hour it would be throttled forever (until Chrome restart). Now
that quota is restored every hour.

BUG=406406
R=zea@chromium.org

Review URL: https://codereview.chromium.org/704453002

Cr-Commit-Position: refs/heads/master@{#302716}