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A constructor of base::{Once,Repeating}Callback takes a pointer to
BindStateBase, that is intended to be used by base::Bind*.
However, the constructor accidentally matches to nullptr parameter, and
that requires a null check of |bind_state| in the callback constructor.

This CL disables nullptr argument on the callback construction.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ic74ca7ce94bc95922e122257d397ff5fbf1fa431
Reviewed-on: https://chromium-review.googlesource.com/1111179
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569782}