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location.replace changes the URL of WKBackForwardListItem. Update the
URL of NavigationItem to that of the host WKBackForwardListItem upon
access. It's done this way because location.replace cannot be reliably
distinguished from normal navigations in either WKNavigationDelegate
callback or URL KVO.

This fixes NavigationTestCase/testWindowLocationReplaceAndChangeHash.

Bug: 807428
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iaef4ed5efd788283050b43a3b4e988311ec9cf76
Reviewed-on: https://chromium-review.googlesource.com/894490
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533315}