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If condition used pending_navigation_params_ that is always false there.
Usage might have been corrupted during refactorings without being noticed,
or was never working.

Skip was removed, CHECK added as well as a TODO to reintroduce the
functionality.

Bug: 882800
Change-Id: I0cafc9dda082a395d48783cac03ec0d25a1ec73e
Reviewed-on: https://chromium-review.googlesource.com/1202462Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590352}