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This change swaps the order of the back and overview pages on the
gesture navigation screen. The new order for the gesture navigation
screen is as follows:
(Intro Page) -> (Home Page) -> (Overview Page) -> (Back Page)

Bug: 976949
Change-Id: Ic621c8c5a69b3b8a5c1e2822605944a94c68d8d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090356Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747926}