Service Worker: Remove the concept of "fail to activate".
Service Worker: Remove the concept of "fail to activate".

As per spec: https://github.com/slightlyoff/ServiceWorker/issues/659

Three-sided patch:
[1] Disable layout tests. (this patch)
[2] Chromium change. https://codereview.chromium.org/1126283005
[3] Fix layout tests. https://codereview.chromium.org/1133493004

BUG=480050

Review URL: https://codereview.chromium.org/1139163003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@195841 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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