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This puts the main frame and iframe into the same site so that the
devtools inspector can watch its network requests.

Also remove access-inspected-object.js from the not-site-per-process
virtual test suite since it was fixed and enabled. The test will be run
without site-isolation in the not_site_per_process_blink_web_tests bot
step.

R=yangguo@chromium.org

Bug: 623268
Change-Id: I1ab5fd22ec988e2aa7de8cea52e207a6f6c4528c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218750
Commit-Queue: Yang Guo <yangguo@chromium.org>
Auto-Submit: danakj <danakj@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772583}