Replacing NetworkControllerTester usages with SimulatedTimeClient since they have corresponding functionality. Bug: webrtc:9510 Change-Id: I4a6a78142a9922e53b862eb8cb71ba9091236346 Reviewed-on: https://webrtc-review.googlesource.com/c/114660 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26048}