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Now that pending NavigationItem are stored in NavigationContext, it
will never be null. Remove the legacy code that checks if pending
NavigationItem exists in CRWWKNavigationHandler.

Bug: 925304
Change-Id: I5eb541f068b4a6db1f5322fed2e7318d686a845a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730424
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683507}