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This CL adds a few variants on the MDB and CRT extension to
download_file_types.asciipb, so that they have reasonable failure
behavior in the event Safe Browsing is unavailable.

Fixed: 1022257, 1022265, 1022732, 1022737, 1022316
Change-Id: I01cd8f79c6ac7b061acdcdf95533e80406074f26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911283
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714820}