Now that FieldTrialsView is (almost) a supported object,
let downstream tests use the ScopedKeyValueConfig for
testing.
Bug: webrtc:10335
Change-Id: I7bf7577387f1123b473275990ca32b80a8ddf9bb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/258480
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36519}
eaf632a8a5