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This only affects the Chromium log formatter of wptrunner.

We want to produce a valid metadata and full logs separately, the former
as the "-expected.txt" artifact and the latter as "-stderr.txt".

Bug: 1154085
Cq-Include-Trybots: luci.chromium.try:linux-wpt-identity-fyi-rel,linux-wpt-input-fyi-rel
Change-Id: I059e05005d2b5f72708c783c5c81deaa86f8b417
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567094
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832486}