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A small refactoring. After the cl, the touchpad/keyboard is only
enabled/disabled when needed.

Bug: None
Change-Id: I1d247f48f8e65cb5345153cfca78efd321ea0280
Reviewed-on: https://chromium-review.googlesource.com/c/1344146
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610948}