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This method looks up the current NavigationItem associated with
WKBackForwardList.currentItem and updates its URL to handle two edge
cases for location.replace. The lookup crashes if
WKBackForwardList.currentItem is nil. The correct NavigationItem to
update in this case is |self.currentNavItem|.

An egtest that triggers this scenario is added; though it's not clear
if this is the only case.

Bug: 866142
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I5c76ad50296127234f498741a62b796fb4397461
Reviewed-on: https://chromium-review.googlesource.com/1228442Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592175}