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This CL replaces NavigationPopup with NavigationSheet for the history
popup menu impl triggered by long press on back button. This allows
the gesture navigation sheet and navigation popup to have same UI.

The only difference between them is that, on long press on back, the
sheet fully expands to show all the items.

Now NavigationPopup class is used by back/forward button on tablet only.

Bug: 999377
Change-Id: Ib68de11f0e5ac5357723ffbd1401c7859393a4ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792687
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698805}