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(Final attempt)

This has been enabled/disabled many times. I recently found the reason
blink was reporting a different sandbox than the one computed by the
browser process. It was caused by the 'reuse' of the LocalDomWindow for
some same-origin navigation from the initial empty document.
Blink was applying sandbox twice by mistake.

Test:
https://chromium-review.googlesource.com/c/chromium/src/+/2578957

Fix:
https://chromium-review.googlesource.com/c/chromium/src/+/2578902

Bug: 1041376
Change-Id: I5ec5339031cf9e744ca1f5bd739783b4cf53bc96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584872Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836090}