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The new MIME types are
* application/pdf
* The types listed in firefox.desktop

R=thestig

Fixes: 1046912
Change-Id: I23e314694a08677f13cee8c1399ae68b58f1aab7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031865
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736994}