Change the ServiceWorker scope in the Push Messaging tests.
Change the ServiceWorker scope in the Push Messaging tests.

The registrations of the ServiceWorker scope outside the script directory will be restricted, as per discussion on https://github.com/slightlyoff/ServiceWorker/issues/468.
So this cl changes the scope which is used in PushMessaging tests.

After this patch will land, I will re-intoruce the scope restriction in Blink side by reverting this: https://codereview.chromium.org/672353003/

BUG=423983

Review URL: https://codereview.chromium.org/644763005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#301312}

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