Migrate RedirectTestCase to web_state_observer_inttest.mm.

This CL merges RedirectTestCase into
WebStateObserverTest.RedirectNavigation.

Bug: 930859
Change-Id: I903d9da7799ec15850ff1c241f96bf9a9cf36ebe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1503461
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638046}
3 files changed