Delete orphaned baseline files.

This list was generated manually as part of auditing baseline files for running WPT on CQ.
Any baseline that couldn't obviously be mapped to a test was included in this CL, and then
some were trimmed away based on trybot results.

Bug: 801368

Change-Id: I0d4392aeb2a9297476de16c5aba45fb52bfc244f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1697427
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676860}
243 files changed