Removes checks that are not relevant to the particular tests. The checks
create dependencies on the CallTest base class. This prepares for
further refactoring in CallTest.
Bug: webrtc:9510
Change-Id: Icd2bb4fe168aabd377d349b1de3de833fb7ae075
Reviewed-on: https://webrtc-review.googlesource.com/87823
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23902}