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The handle conversion requires an extra cast on Windows.

TBR=ajwong@chromium.org

Change-Id: If7da57e0314496e3922cd0634b4ec8ab4e063f48
Reviewed-on: https://chromium-review.googlesource.com/580668Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488511}