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This reverts commit 3e49c929.

Reason for revert: This is a culprit of ChromiumOS test failure:
https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/17426
Fixes: 1044826

Original change's description:
> [CrOS Printing] Don't send username and filename unencrypted
> 
> This situation may come up if policy was changed after printer was
> selected. We reject printing job since silently omitting username and
> filename could be confusing.
> 
> Bug: 1042798
> Change-Id: Iba385503d8f7e960291728d6515ca7c236220847
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004992
> Reviewed-by: Sean Kau <skau@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Commit-Queue: Lei Zhang <thestig@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#734128}

TBR=thestig@chromium.org,vkuzkokov@chromium.org,skau@chromium.org

Change-Id: I5edc2769677fc26c5810fe38d77d03700473c8bc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1042798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015906Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734310}