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The download deep scanning mocks suggested a few design improvements for download
warnings in general, outside the enterprise space. One such improvement
was to place the warning icon over the file icon as a sort of badge,
to preserve continuity.

Link to mocks: https://docs.google.com/presentation/d/1MH7zM5YiuCZr3jYsqkTJRC0cqtdo8wuWZOOQ66jptVk/edit#slide=id.g5e05da6dd9_0_63
Screenshots:
In progress: https://screenshot.googleplex.com/76WnABzzaWS.png
Paused: https://screenshot.googleplex.com/ytFeKiXBVOS.png
Failed: https://screenshot.googleplex.com/jVYPuOzQqxU.png
Complete: https://screenshot.googleplex.com/GgwNkEYu0bC.png
Dangerous: https://screenshot.googleplex.com/57bs5vLAYd3.png

Bug: 1020423
Change-Id: I32e4660a71fbc3b9333b64666d56a3378035bd7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898520Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714035}