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CupsPrinters is becoming a BCKS. This change modifies services using it
to create and store handles to it correctly.

BUG=chromium:829492
TEST=manually ensured behavior unchanged

Change-Id: Ibca680fd3b29314b38a72288ed28f6b0f2dca42e
Reviewed-on: https://chromium-review.googlesource.com/998612Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553663}