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This CL changes the type of OutputProtectionDelegate callbacks to
OnceCallback, and fixes an uninitialized member variable.

Bug: 929449
Test: Build
Change-Id: If3bd6cc96fa2056ce59d044e68bc727166a5d720
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1597225
Commit-Queue: Dominik Laskowski <domlaskowski@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671495}