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Several web platform tests do not have physical files checked into the
WPT repository. Instead they are generated and mapped to test harnesses
checked into the WPT repo. When those test harnesses are deleted then
we should delete all tests mapped to those files. Only affects the
behavior of the script when --clean-up-affected-tests-only is used.

Bug: 1050760, 1110003, 801357
Change-Id: Id1c30b096c73974ed0ded2d74284fbe43005ee0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439417
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816865}