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We know the navigation's can have an initiator_routing_id, but with no
corresponding RenderFrameHost, even at the beginning of the navigation.

We know this is true, but it turns out this isn't covered.
This is shown by this tryjob:
https://chromium-review.googlesource.com/c/chromium/src/+/2413265/3

This patch adds it.

Bug: 1059959
Change-Id: I0bf0e4d86ffd056b00e647a8c01c9ec3710e26f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414172
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811192}