Relax same-origin policy for ServiceWorker openWindow() in Chromium.
Per blink-dev discussion:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/vCd9TysLAso/UcNQMme-9LsJ
This is relaxing the browser-side checks in order to no longer kill a
renderer process if it tries to open a cross-origin window from a service
worker. It will allow the Blink restriction to be relaxed:
https://codereview.chromium.org/
985043002
The browser process now checks whether the renderer process is allowed
access to the given URL, blocking access to special URLs like chrome://.
BUG=457187
Review URL: https://codereview.chromium.org/
980383004
Cr-Commit-Position: refs/heads/master@{#319648}