Upstream service worker "timing" test to WPT

The version of this test in the Chromium source tree is equivalent to
the version available in the Web Platform Tests project. The WPT version
was previously marked as an expected failure because it constructed URLs
in terms of the HTTP protocol. This is correct within the Chromium
infrastructure (where the "secure context" requirement of the service
worker specification is satisfied by the use of the origin `127.0.0.1`),
but it is inappropriate for use within the WPT testing infrastructure
(where HTTPS is used to provide a secure context).

Correct the upstream version of the test, remove Chromium's "expected
failure" file, and remove the Chromium version of the test.

BUG=688116, 678905
R=falken@chromium.org

Review-Url: https://codereview.chromium.org/2895473002
Cr-Commit-Position: refs/heads/master@{#473206}
5 files changed