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Based on UX feedback we don't want a "learn more" link in the dropdown,
and there's nothing a user can do with these downloads since they have
been blocked, so remove the dropdown entirely.

Old screenshot: https://screenshot.googleplex.com/7r65OQPO7Xs.png
New screenshot: https://screenshot.googleplex.com/TPkBgzZMDYT.png

Fixed: 1069527
Change-Id: I81b7eee8399ef1ba3e5ec449bee6c6899b09db58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321329
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792370}