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This is a reland of 88854e15

Original change's description:
> Whitelist Imprivata extensions for networking.onc API
> 
> Whitelisting the Imprivata extensions so that they can send their local
> IP + MAC address to the Imprivata server, which are being used in the
> Imprivata admin consoleto assign the device to a specific "site" and
> also to assign computer policies to specific devices.
> 
> Bug: 1075877
> Change-Id: Id3a14b2ac5618dfcbc6c476da555153792debe57
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2169888
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
> Auto-Submit: Alexander Hendrich <hendrich@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#768029}

Bug: 1075877
Change-Id: I73fcce371de0568ea470ca518b856b8e52ba1914
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2203376
Auto-Submit: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769060}