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Previously Flush() was taking base::Closure, which is deprecated.
Replaced with base::OnceClosure.

Bug: 751838
Change-Id: Iccd5bb58b262cb67f87810613b180da9148fe145
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940300
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719849}