GitLab

This hides the internal URL used by WKBasedNavigationManager to force
create an entry in WKBackForwardList when reloading with a different
user agent type (see crrev.com/c/919175).

Also fixed a bug in NavigationManagerTest which wasn't testing the
redirect case when GetParam() == TEST_WK_BASED_NAVIGATION_MANAGER.

Bug: 833958
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I095178302bfc4d209c2d058aab736777cc8b2de4
Reviewed-on: https://chromium-review.googlesource.com/1016002Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551548}