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All clients of BCKSF uses the new API taking a base::Callback<>
instead of the deprecated API that was using a raw function
pointer.

Remove the now obsolete deprecated API.

Bug: 809610
Change-Id: I18359b2f91a1a6d9445affcf4720eed528d74af3
Reviewed-on: https://chromium-review.googlesource.com/c/1297354Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603106}