This test used a fixture to create the send queue, but that makes it
hard to construct them with different parameters in some tests.
This refactoring removes the test fixture and creates the queue in each
test, which improves test readability instead, as there will be no need
for remembering how it was created - that's given by each test now.
Bug: webrtc:393540127
Change-Id: I8d158b6ff57fe9cb03b2762d736cf79afbbb8283
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/376100
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43880}
625884e7ca