Invalidate associated WKBackForwardListItem after replace state.

Bug: 887273
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I99e171f64a20c7dba9f8984d05cb509b00d01ea5
Reviewed-on: https://chromium-review.googlesource.com/1243166
Reviewed-by: Danyao Wang <danyao@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593992}