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Remove the code for the arrow icon no longer used in the new layout.

Bug: 1143472
Change-Id: Ic003e16bb392d21ba7136383b20511f705fd606f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560931Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Eric Lawrence [MSFT] <ericlaw@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#832401}