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We changed the MIME type in https://github.com/w3c/reporting/issues/51
as part of the TAG review of the spec.

Bug: 868065
Change-Id: I4d8020bb39ef12b0695d5f5b16c56eaf2cf0a50e
Reviewed-on: https://chromium-review.googlesource.com/1152069Reviewed-by: Misha Efimov <mef@chromium.org>
Commit-Queue: Douglas Creager <dcreager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578656}