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Based on the given |file_type|, GetRecentFiles to disk sources should
filtered result.
File types of the files inside disk sources will be guessed by file
extensions (inside net::GetMimeTypeFromFile()).

Bug: 1040049
Test: Ran unit_tests
Change-Id: I7ae9c5b71bbc2fc25016149fdf8e8a98d6b1b5f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011592
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733559}