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This reverts commit 8fabb768.

Reason for revert: Incomplete migration. Will try again soonish

Original change's description:
> Migrate to metadata v2 and support PPD Restrictions
>
> Update the GetPrintersURL call to utilize metadata_v2. This allows for certain
> restrictions to be placed on the model to determine whether or not the printer should be displayed
>
> Bug: chromium:773766
> Change-Id: Iaade00489a066340a095b3b07bbd853f13f8e35a
> Reviewed-on: https://chromium-review.googlesource.com/797476
> Commit-Queue: Luum Habtemariam <luum@chromium.org>
> Reviewed-by: Sean Kau <skau@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#521064}

TBR=stevenjb@chromium.org,skau@chromium.org,justincarlson@chromium.org,luum@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:773766
Change-Id: Ia17119151bf2d88951589b47e2ea0c1c38796cd2
Reviewed-on: https://chromium-review.googlesource.com/820291Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523177}