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Implements class DirectSocketsServiceImpl::ResolveHostAndOpenSocket to
finish the resolution of remote hostname.

This job is performed asynchronously.

Below documents are from Eric Willigers <ericwilligers@chromium.org>.
Explainer: https://github.com/WICG/raw-sockets/blob/master/docs/explainer.md

Design doc:
https://docs.google.com/document/d/1Xa5nFkIWxkL3hZHvDYWPhT8sZvNeFpCUKNuqIwZHxnE/edit?usp=sharing

Bug: 905818
Change-Id: Ie040b0b1dc05025030df74b3e81663c94377c2ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603775
Commit-Queue: Ke He <kehe@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839845}