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Use an existing pref, "cloud_print.deprecation_warnings_suppressed", to
suppress deprecation warnings.

TBR=thestig@chromium.org

Bug: 1112581
Change-Id: I76af61dc4b1faa387e179121dafe48a361c2ad7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363448
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799986}