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Translates between the UrlRequest/UrlResponse (flat string) and
blink::WebURLRequest/blink::WebURLResponse (key-value map) header
formats, based on the behavior of Pepper's
content::CreateWebURLRequest() and content::DataFromWebURLResponse().

The Pepper methods do not distinguish between absent and empty strings,
so UrlRequest and UrlResponse now use empty strings as the "absent"
value as well, as there's no need to support this state separately.

Bug: 1099022
Change-Id: Ia509bea005f356ccbe2bb79aff73a01fd3fd9eed
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415374Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808171}