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When quickly navigating back or forward, it's possible to trigger the
following WebKit error:
"[ProcessSwapping] WebPageProxy::suspendCurrentPageIfPossible: Not suspending
current page for process pid XXXX because fromItem's URL does not match the
page URL."

When this happens, the WKBackForwardList gets out of sync with the webView,
and currentItem.URL does not match webView.URL. This workaround takes the
naive approach and looks to see if the next or previous WKBackForwardList
item has the correct URL.

Bug: 960326
Change-Id: I2b9d9355949fcc3978aef4f37584bb4aeade75a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627703
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664071}