[ServiceWorker] Fills SSLInfo of the response from a SW with the SSLInfo of the SW...

[ServiceWorker] Fills SSLInfo of the response from a SW with the SSLInfo of the SW script.

After https://codereview.chromium.org/874833003/, every mixed-content requests from the ServiceWorker are blocked.
So we can show the HTTPS padlock because every responses from the ServiceWorker to the page are created using the resources which are served through the secure protocol.

To show the padlock we fill the SSLInfo of the response from the ServiceWorker using the SSLInfo of the ServiceWorker script.

When we support fetching mixed-content requests from the ServiceWorker in the future, we have to check the security level of the responses.

BUG=392409

Review URL: https://codereview.chromium.org/877623002

Cr-Commit-Position: refs/heads/master@{#314549}