Test262 has a couple of duplicated test files with the identical inside both
"test262/data/test" and "test262/local-tests/test".

Testrunner used to deduplicate the tests, which masked this issue.

This CL removes the obsolete copies in the local-tests.

R=adamk@chromium.org,yangguo@chromium.org,machenbach@chromium.org

Bug: v8:8174,v8:8728
Change-Id: Iecdc40b417f237feb916f1c3a24f8def7ea11fad
Reviewed-on: https://chromium-review.googlesource.com/c/1452436Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59354}