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This cl adds TODO to remove the dependency on aura::Window in Keyboard
Shortcuts Viewer. In addition, this cl removes unused deps and include.

Bug: 833673
Test: Manual
Change-Id: Icc4fd0726cace1971674e371bb5053b20575933b
Reviewed-on: https://chromium-review.googlesource.com/1014663Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551348}