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This change updates ppapi::RunWhileLocked and ppapi::CallWhileUnlocked
to use base::OnceClosure and base::OnceCallback instead of base::Closure
and base::Callback.

Bug: 714018
Change-Id: I7e827ecffe2baca3a681cf3e27982263c89f9f34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011927
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734397}