[ios] Check for non nil webState, not tab, for NewTabPageTabHelper.
Bug: 934294 Change-Id: I34eac982df5e4ce23a7e748debe9b118cd88afb4 Reviewed-on: https://chromium-review.googlesource.com/c/1481491 Commit-Queue: Justin Cohen <justincohen@chromium.org> Auto-Submit: Justin Cohen <justincohen@chromium.org> Reviewed-by:Kurt Horimoto <kkhorimoto@chromium.org> Cr-Commit-Position: refs/heads/master@{#634365}
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