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This CL removes a few unused libraries from HatService and fixes small
style nits. Funcionality is untouched.

Bug: None
Test: Build.
Change-Id: Ic6132da73f728b86a0a8b58afb7021125166a3ac
Reviewed-on: https://chromium-review.googlesource.com/c/1324609
Commit-Queue: David Jacobo <djacobo@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606274}