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Android's New Tab Page has an empty site URL by design to let navigations
from the NTP use the same process. The site URL is assigned after the
navigation is committed. However, this doesn't interact well with
SW. SW is created in a process suitable for the service worker's script
URL, and the navigation stays in the NTP process, so the SW is
out-of-process which has a performance and memory cost.

With this CL, when the SW process is chosen, it takes a process that
hasn't yet been assigned to a SiteInstance. The idea is to choose the
Android NTP process.

Bug: 1012143
Change-Id: I423de186982a11c68e4c2bec7b5ca56b3245f62c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849473
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707274}