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GetNavigationItemImplAtIndex() appears to return a nil |cached_item|
sometimes, perhaps due to a mismatch in WKWebView's backForwardList.
Returning early when this happens in RestoreItemsState() may break
some restore state features, but should not put the user in a broken
state.

Bug: 1134096
Change-Id: I47a2f1316375860b223fa988e7aca9e4557057d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454291Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815204}