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This is shown to the users if a non-whitelisted extension calls
chrome.printing.submitJob().
If user clicks "Accept" button, the print job is sent to the printer.
If they click "Deny" button, the dialog is closed and nothing happens,
extension receives REJECTED status.

Bug: 996785
Change-Id: Idf9cbc5af4ae740252ac32d2a64f6928c61eb955
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007277
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738225}