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This change updates the position of the clipboard nudge when the
shelf is set to auto-hide. Also updates position for the case when
side shelf is set to left or right.

Bug: 1165974
Change-Id: Ib44089b2a8df58e12c4dd54c23aa21b17a374d3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628737
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844157}