This reverts commit 8c2250eddc7263036397179a0794b9b17d7afb38. Reason for revert: breaks downstream project Original change's description: > Replace RTC_WARN_UNUSED_RESULT with ABSL_MUST_USE_RESULT in c++ code > > Bug: webrtc:12336 > Change-Id: If76f00d0883b5c8a90d3ef5554f5e22384b3fb58 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/197620 > Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> > Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> > Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#32978} TBR=danilchap@webrtc.org,mbonadei@webrtc.org,crodbro@webrtc.org Change-Id: I5c9d419785254878a825865808b56841cd30b9b5 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: webrtc:12336 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/201731 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32979}