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AddressFamily is defined in host resolver mojom file. This CL makes it into
its own mojom file.

Bug: 721401
Change-Id: I29585ea8c35a63d543c4280b43d7f3fc70073eef
Reviewed-on: https://chromium-review.googlesource.com/826006Reviewed-by: Randy Smith <rdsmith@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524270}