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After this cl, "application/signed-exchange;v=b0" will be used for SignedHTTPExchange.

Bug: 803774
Change-Id: I07e6218f07fb6917b1617ea208dcc7da31f13edf
Reviewed-on: https://chromium-review.googlesource.com/964024Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543611}