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This serializes the values returned from parsing structured headers,
according to https://tools.ietf.org/html/draft-ietf-httpbis-header-structure-13.

Bug: 1011101
Change-Id: I33c0a80bd7cbe17c96bf9ef9803af32a1a7506ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872940
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714677}