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Transient navigation entries were only used for non-committed (overlay)
interstitials and a few tests. Since overlay interstitials have been
removed, this CL changes the tests to use regular entries, and removes
the transient entry concept.

Bug: 1077074

Change-Id: Ide09a628fae91a04308ae26efde7112f1e468250
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149954
Auto-Submit: Carlos IL <carlosil@chromium.org>
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771811}