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There is a bug where users can keep their clamshell mode context menu
open by detaching the keyboard. This allows users to have a side shelf
in tablet mode, and they may get stuck in this state.

This CL prevents this from happening by ignoring the clamshell options
if they are somehow executed in tablet mode.

Bug: 870469
Change-Id: Ifb9638c3ae705bd58a2e785edc5ca84d698651d2
Reviewed-on: https://chromium-review.googlesource.com/1161387Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581030}