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This is a reland of 3e49c929

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,skau@chromium.org,yoichio@chromium.org

Bug: 1042798
Change-Id: I75d30cc7c94d843cbbc32318907165bfede6df69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015029Reviewed-by: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Commit-Queue: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734453}