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When prompting the user for APP scanning, the "Discard" button is still
present in the download shelf. It hidden behind the "Scan" button,
but still accessible via Tab/Enter keys, leading to accidental discards
when operating via keyboard.

This CL makes no visible changes to the UX.

Bug: 1049748
Change-Id: Ie4cb9fbc42341cca76bc5479e4ca9f207f7e9226
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042388Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739147}