The iOS 11 SDK adds nullability annotations to several framework functions
and in this it added the _Nonnull specifier to a protocol method that
we implement. We were passing nil to that method in a test.
The warning is now fixed by passing a mock object instead of nil.
Bug: webrtc:7883
Change-Id: I9f64b0c59750629ca3969400aa725729bb10541b
Reviewed-on: https://chromium-review.googlesource.com/549927
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Kári Tristan Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18780}
17c11ec37c