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This change makes the back button act the same way
when clicked as when selected (both in the menu,
and when the back button appears alone while
navigating outside the menu).

Test: With emulated Chrome OS on Linux and
the Switch Access and improved text input flags enabled
(--enable-experimental-accessibility-switch-access and
--enable-experimental-accessibility-switch-access-text),
checked that the back button behaved the same way when
clicked as when selected with a switch.

Bug: 999581
Change-Id: I564f2be0da353fb1c912b090d9bc9fc58dc84f2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779104Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: Sophie Yang <sophyang@google.com>
Cr-Commit-Position: refs/heads/master@{#693935}