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The mime types for xls and xlsx are listed on MDN[1] and on iana.org[2].

[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
[2] https://www.iana.org/assignments/media-types/media-types.xhtml

Although the OS mime type <-> file extension mapping usually gets
xls/xlsx for us, it appears that in some cases and on some users
machines it doesn't happen. The reporter of this bug had it happen on
their mac, and the windows cq+1 trybot fails the test without the patch.

Bug: 1132791
Change-Id: I4fc35bc3387d98b5967d0a476788b32bf6e2c6f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462664Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816688}