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StringPieces all the way through the MIME sniffing code.

This CL only updates net/ consumers to use the overloads, which are all
test-only code. I'll update consumers and remove the old methods in
another CL.

Bug: 1123179
Change-Id: I04328913fa1c7bfd9049fa7aaae6a8a538cbe8e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382896
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803339}