After the refactoring, the test fixture is only used for creating the object under test and dependencies. This leads to more readable code and allows more flexibility when creating the object under test. Bug: none Change-Id: I643330290da17efe0a02fe5dc6b884136705de0b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/248140 Reviewed-by: Björn Terelius <terelius@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35770}