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This is a reland of 295cd31f.

Original change's description:
> [Nav Experiment] Update NavigationItem URL for location.replace.
> 
> 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}

Bug: 807428
Change-Id: I2f237fe6a03b38592eccf1adedcf8c5679552201
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/900103
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534818}