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This also eliminates a few unnecessary includes.

Bug: 798569
For c/b/chromeos/policy DEPS changes:
TBR=emaxx@chromium.org

Change-Id: I80a73a68819f0295f9c81b910467c6e38dd2571e
Reviewed-on: https://chromium-review.googlesource.com/1041568
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558796}