service worker: Remove some unnecessary "chromium." tests.

These tests are duplicates of WPT tests. They were originally needed to
preserve test coverage because the WPT tests were timing out. However the time
outs no longer occur, so we can remove the dupes.

Bug: 658997
Change-Id: Ib3c76cd32274b5c4fc7838cdec943033420946b4
Reviewed-on: https://chromium-review.googlesource.com/737291
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511373}
13 files changed