Add isDeleted flag to ServiceWorkerRegistration in DevTool's protocol.
Add isDeleted flag to ServiceWorkerRegistration in DevTool's protocol.

We shuold show the registrations which are already deleted from the storage but are still exist in the memory.
This could happen when ServiceWorkerRegistration.unregister() has been called but there are still some controlled pages.

I will remove workerRegistrationDeleted event after chromium side patch (https://codereview.chromium.org/998173002/) will be landed.

BUG=463892

Review URL: https://codereview.chromium.org/996363002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191776 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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