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As far as we want to reuse StickySettings in Printing API for
extracting information about recent printer activity we should place it
in more appropriate component.

Also create GetInstance() function to support the assumption that only
one instance of the class is instantiated.

Background: crrev.com/c/1893206

Bug: 996785
Change-Id: I6c5205ef181e56836954f83990a007ee04f351ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947738
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721430}