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This will allow us to convert more Callbacks in the bluetooth component
over to OnceCallbacks, which will let us convert Callbacks in content
eventually.

R=reillyg@chromium.org

Bug: 953861
Change-Id: I21555216157c1d56249c6ec93c910ce19a68f8a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572368Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652222}