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This CL adds UX on the chrome://downloads page for all the new WebProtect
download states. These correspond to the changes made in the download shelf.

Screenshots:
https://screenshot.googleplex.com/DgQ6RMa47eU.png
https://screenshot.googleplex.com/cRWuijJRw8H.png
https://screenshot.googleplex.com/dT5XRGgX1v0.png
https://screenshot.googleplex.com/5d1DfXa3WYf.png
https://screenshot.googleplex.com/sYeBGWwuJrb.png
https://screenshot.googleplex.com/VAobzSD4J89.png

Bug: 980777
Change-Id: I7b4f8e99dc61cf7c7135fd0a9c03dffefd574f9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865039
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707244}