Cleaned up didReceiveServerRedirectForProvisionalNavigation:

Do not call registerLoadRequestForURL: just to update pending item URL.
Use NavigationContext as a source of truth for URL update instead.

Bug: 805900
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Idb26cf953088a0dafcdb8c80396f2bca93d30c16
Reviewed-on: https://chromium-review.googlesource.com/909704
Reviewed-by: Danyao Wang <danyao@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535711}
1 file changed