mac: disable ServiceWorker API tests

These tests are flaky on Mac, especially in Views mode.

Bug: 845979
Change-Id: Idb2125c8ce24595e501df8544609f0c6e6dd8957
Reviewed-on: https://chromium-review.googlesource.com/1070338
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562824}
1 file changed