[Code Health] Remove unnecessary reference file for web test

The test used to be a ref test but upon upstreaming to wpt it was
updated to a non-ref test.

Change-Id: I9a7d793698e7abae540ecbc92e3c293ac7195e45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1557855
Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650657}
2 files changed