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Previously we used a invisible overlay ontop of the guest iframe to hold
two green buttons for navigating forward and backwards in the current
directory. Since then we have moved the navigation ui down into the guest
frame (see cl/304099160) for better behavior, UX and a11y. This Cl
removes this invisible overlay and the two buttons as they are no longer
needed.


Bug: 996088
Change-Id: Ic9307d90f9fb3ecd1f5a5ef30d4e078810625833
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131676Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Zain Afzal <zafzal@google.com>
Cr-Commit-Position: refs/heads/master@{#755281}