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They are contained in net::HttpResponseHeaders which is also contained
in the struct.

Bug: 721400
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I11b438790fc351ba9097bb44415c5c5c4ca923c3
Reviewed-on: https://chromium-review.googlesource.com/1071327
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561436}