Convert content_unittests to using NavigationSimulator

This CL converts some more content_unittests to using
NavigationSimulator. This is needed to enforce having a proper
NavigationRequest at commit time.

Bug: 728571
Change-Id: I3ec6628278f74dc98180a2f74464bae8a873c4fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581630
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657185}
2 files changed