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This patch teaches SignedExchangeHandler to decode signed exchange
body encoded with the application/http-exchange+cbor format [1].

The test file origin-signed-response-iframe.htxg was created using
gen-signedexchange of [2] with the following command:

gen-signedexchange -uri https://example.com/test.html \
    -content test.html -o origin-signed-response-iframe.htxg \
    -miRecordSize=100

where test.html is the html part of origin-signed-response-iframe.php
before this patch.

[1] https://wicg.github.io/webpackage/draft-yasskin-http-origin-signed-responses.html#rfc.section.5
[2] https://github.com/WICG/webpackage/pull/119

Bug: 803774
Change-Id: I4d7bf5215e825cfa084c431db6d2cc87219d0a34
Reviewed-on: https://chromium-review.googlesource.com/897172
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534643}