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This patch makes the callback params optional for
BluetoothDiscoverySession::Stop and removes all the passed callbacks
from the callers. Further changes will be made to completely removes
the callback params.

Bug: 991682
Change-Id: I6c7a3b1a8bd7a06a5d724618609cad8d8dbba898
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068886Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Commit-Queue: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744757}