Remove obsolete WebUSB Origin Trial test file

The associated test was removed in
https://chromium-review.googlesource.com/513366.

Bug: 492204
Change-Id: I1924c7fce2e304d78bad4718aa8252f9e8c96774
Reviewed-on: https://chromium-review.googlesource.com/1006217
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549757}
1 file changed