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This reverts commit 4c3e1c10.

Reason for revert: This CL introduces massive crashes in M78.

Original change's description:
> Remove legacy check on null NavigationItem in CRWWKNavigationHandler
> 
> 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}

TBR=eugenebut@chromium.org,mrsuyi@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 925304
Change-Id: I091ae74a41d23454ac1af0ba6c752af9a6d7f41c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878749Reviewed-by: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709080}