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This CL converts old Mojo types used by MimeSniffingURLLoader and its unit
test to new Mojo types.

Bug: 955171
Change-Id: I142abf816370adba3ad44fa26cbaf0e86a1e61c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817956Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Cr-Commit-Position: refs/heads/master@{#700184}