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This converts the old RESULT lines to the new perf test reporter.
It would be hard to port the result reporter to WebRTC, so let's keep
the WebRTC code ignorant of that.

Bug: chromium:1874811
Change-Id: I524fd3f24fa2739043e4facfa93cb1300a22a5c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899865Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715228}