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Navigation restoring a page from the back-forward cache do not wait
for a renderer to reply and commit synchronously, therefore there is
no need to simulate a renderer sending a commit ACK.

This patch teaches NavigationSimulator to mark bfcached navigation
as finished as soon as it commits.

R=clamy@chromium.org,arthursonzogni@chromium.org,rakina@chromium.org,fergal@chromium.org
BUG=1015328

Change-Id: I8251a2190bb20ecce4027519d4d6eb9a40929e8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893170
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719352}