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This CL moves the final user-timing tests to external/wpt and removes
the folder. The performance_entrylist_checker is changed as in the http
counterpart to allow de-duplicating test messages.

There are some tests that are related to the wpt counterparts, but not
equivalent and in a different format, so unifying some of these tests
can be done in the future.

Bug: 498037
Change-Id: I6f35d962ba088d92a9768e49a65dea4d5c267491
Reviewed-on: https://chromium-review.googlesource.com/1007888Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550310}