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Declare std::unique_ptr specializations for CUPS in one place.

Change-Id: Iffa00a1cfb4167ff4b46fdbffcfd4c367ffe1ac5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1782880
Auto-Submit: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695683}