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This CL removes most of the usages of
RenderFrameHostTester::SimulateNavigationStart outside of content/ in
favor of using NavigationSimulator. The goal is to have embedders of
content/ use the NavigationSimulator exclusively when writing unit tests
that involve navigation. This allows several tests to work with
PlzNavigate or OOPIF enabled.

BUG=728571

Change-Id: Iab0efe63d3c892da62ffe4e5cc2641e9af0f03a3
Reviewed-on: https://chromium-review.googlesource.com/582949
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Nathan Parker <nparker@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491791}