Use USB mojo interfaces in PrinterProviderApi.

Bug: 716628
Change-Id: If48a9b1aaa71a9264475dd0ad62707a45bd927e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1493716
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Donna Wu <donna.wu@intel.com>
Cr-Commit-Position: refs/heads/master@{#637583}
6 files changed