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In content/, this CL replace every renderer-initiated navigations
started with TestRenderFrameHost::SimulateNavigationStart() with a
navigation using the NavigationSimulator.

Bug: 728571

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation;master.tryserver.chromium.linux:linux_chromium_browser_side_navigation_rel
Change-Id: Ibe7bf13c645d202af1a7bb1dd9aecdc20a50d288
Reviewed-on: https://chromium-review.googlesource.com/574865
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488625}