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These tests were moved to a different directory in upstream WPT.
Deleting them under their old names will allow wpt-import to run and
avoid lint errors about these tests not existing under their new name.
Once import runs (and renames the tests on the chromium side), they will
be re-added to the expectations files under their new path.

TBR=rmhasan

Bug: 1110003
Change-Id: I50fedbd09a0d493d47b2765ee6d871d4395e25bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321049Reviewed-by: Luke Z <lpz@chromium.org>
Reviewed-by: Rakib Hasan <rmhasan@google.com>
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Cr-Commit-Position: refs/heads/master@{#791986}