In order to unify WebRTC recipes with Chromium recipes this CL tries to revert the old CL https://webrtc-review.googlesource.com/c/src/+/171681. This CL was already partially reverted (https://webrtc-review.googlesource.com/c/src/+/171809). In upcoming CLs, the added flag dump_json_test_results will be removed in order to use isolated-script-test-output instead. Bug: webrtc:13556 Change-Id: I3144498b9a5cbaa56c23b3b8adbac2229ad63c37 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/245602 Reviewed-by: Andrey Logvin <landrey@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Jeremy Leconte <jleconte@google.com> Cr-Commit-Position: refs/heads/main@{#35666}