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After this patch, Web Bundles response from network without
"X-Content-Type-Options: nosniff" header will cause
net::ERR_INVALID_WEB_BUNDLE error.

Spec: https://wicg.github.io/webpackage/draft-yasskin-wpack-bundled-exchanges.html#name-serving-constraints

Bug: 1018640
Change-Id: I32632ee547ab32ea6646d0150dcc9493c374c263
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992944Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731849}