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tzik authored
base::BarrierClosure calls the given callback object only once upon the Nth invocation of resulting wrapper callback. That means, the wrapped callback should be OnceCallback, and the resulting callback should be RepeatingCallback. BUG=714018 Review-Url: https://codereview.chromium.org/2833293004 Cr-Commit-Position: refs/heads/master@{#467664}
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