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These methods were never implemented for WKBasedNavigationManager, which
is now the only concrete implementation of NavigationManager.

Bug: 533848, 1156272
Change-Id: Ia705e35a9605494b468308a97eca7df81dd29a1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577918
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834408}