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tzik authored
This CL converts WaitableEvent::EventCallback to base::OnceCallback from base::Callback. The non-trivial part is in IPC code. It's called only once anyway, but it has been cancelled and copied there. BUG=554299 TBR=msramek@chromium.org Review-Url: https://codereview.chromium.org/2801593002 Cr-Commit-Position: refs/heads/master@{#465128}
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