ServiceWorker: Remove wildcard from scope (Blink)

Wildcard '*' was removed from scope matching algorithm in the spec.
This change removes a wildcard from scopes used in layout tests and
the default scope for register/unregister interfaces.

Spec: https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#registration-option-list-dictionary
Issue: https://github.com/slightlyoff/ServiceWorker/issues/287


BUG=398892
TEST=run_webkit_tests.py http/tests/serviceworker

Review URL: https://codereview.chromium.org/426603005

git-svn-id: svn://svn.chromium.org/blink/trunk@179574 bbb929c8-8fbe-4397-9dbb-9b2b20218538