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This CL allows to set a custom PageState in the NavigationSimulator and
converst one unit test that needed this functionality to using
NavigationSimulator.

Bug: 728571
Change-Id: Ie62b87f328f52e6ae51357a3ebfa9f295ea7ac80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1569017Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652508}