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This imports all of the tests from the public test repository at
https://github.com/httpwg/structured-header-tests, which have been
automatically converted from JSON to C++ unit tests.

Tests which were already present in structured_headers_unittest.cc
have been removed from that file, to avoid needless redundancy.

Bug: 1069790
Change-Id: I05536c36cb66c7dda43aab2f6c5ae77961120a6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146237
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759015}