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Since '\0' delimited concatenation of header field values is not allowed any
more in HTTP/2 draft-14, but servers might prepare such headers, the HPACK
encoder should split them into multiple headers with identical names.

This lands server change 74384948 by bnc.

BUG=400336

Review URL: https://codereview.chromium.org/533073004

Cr-Commit-Position: refs/heads/master@{#293537}