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This reverts commit 29499d24.

Reason for revert: Broke the linux-chromeos-chrome bot.
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/7735

Original change's description:
> Convert scanning app to system web app (SWA)
> 
> The SWA uses a temporary icon and is hidden behind a feature flag that
> is disabled by default.
> 
> Bug: 1059779
> Change-Id: I9cee9b2de42a49285a8ee5ba2877d6394a7ca5b2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348539
> Commit-Queue: Jesse Schettler <jschettler@chromium.org>
> Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
> Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798367}

TBR=khorimoto@chromium.org,ortuno@chromium.org,jimmyxgong@chromium.org,jschettler@chromium.org

Change-Id: I63c9b0497c709def532c052a8c6bdc4eb8f0a200
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1059779
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358569Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798389}