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: I12d445f4bb4bbe3929049e92f8c7074cc9d753ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535886
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653183}
2 files changed