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The purpose of this patch is to directly open Files.app to present downloaded files from Chrome.
To open Files.app from Chrome, I use a URL which unfortunately is not documented but still used by Apple to create folder shortcuts.
This functionality is developed under a flag "kOpenDownloadsInFilesApp".

Bug: 1052851
Change-Id: I30d9ba7cdafbddd5bc852faf3ce8bc83807bafb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2060370Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747300}