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rbpotter authored
Only the AddedPrintersCallback should be called multiple times. Change other callbacks to OnceCallback and AddedPrinters to RepeatingCallback to clarify this, and modify other classes as appropriate. Bug: None Change-Id: Ic2f551a279fdc7a266cf697d57c16f33da76394a Reviewed-on: https://chromium-review.googlesource.com/734700 Reviewed-by: Toni Barzic <tbarzic@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Rebekah Potter <rbpotter@chromium.org> Cr-Commit-Position: refs/heads/master@{#512249}
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