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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 fixes the bug by explicitly closing menus when tablet mode state
changes.

Bug: 870469
Change-Id: I72bb42733000077947219f5868d32615738ab80d
Reviewed-on: https://chromium-review.googlesource.com/1165699
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581362}