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It is possible for WKWebView.URL to be empty inside
webView:didCommitNavigation:. That's probably a bug, but WKWebView.URL
does not represent last committed URL anyway, so it is safer to fallback
to  WKBackForwardList's currentItem when WKWebView.URL is nil.

Using webView.backForwardList.currentItem.URL everywhere is not an option
because that URL is not correct for WebUI pages loaded via loadHTML:.
After dropping iOS 10 and switching WebUI to iOS 11's custom URL protocols
it might be possible to use webView.backForwardList.currentItem.URL
unconditionally.

Bug: 784480
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2c2cdb9fad425afec6756bc8e841389e979d066b
Reviewed-on: https://chromium-review.googlesource.com/773621
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518355}