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r772108 prevented these non-native files from being offered to web apps
that use the file handling API due to lack of support. r778183 added
the support for known use-cases used by the chrome://media-app "System"
Web App.

This CL tweaks the logic added by r772108 so that chrome://media-app
(specifically) is allowed to act as a file handler for these non-native
files.

Bug: 1079065, b/157532509
Change-Id: I8f198357b9b5ecd487edb37255a7a55e09295232
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249402Reviewed-by: Chase Phillips <cmp@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780036}