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This change converts all of the base::Bind and base::Callback to their
Once counterparts for bluetooth_socket_mac.{h,mm}. This change also
affects any files that interact with this class.

Bug: 1007780
Change-Id: If3c6b2e24ecd3cac18a9a726fa7b5e78d00b05e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904529Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717701}