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This CL just removes some includes that aren't used.

CrOS-style shadows are planned for more parts of the Chrome UI - parts
the window manager doesn't have good control over. So some files may
need to move.

Bug: 801583
Change-Id: I1a5a31908ae74ce373198e16dfa2809d4d60023a
Reviewed-on: https://chromium-review.googlesource.com/892585Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533056}