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Replace it with GetNetworkInterfaceList() which more accurately describe
what it does. Use base::PostTaskWithTraitsAndReplyWithResult() so it
does not need to know how to reply.

Change-Id: Ibc9f9cdec03cbc602903fc2342c9629ba79aa42d
Reviewed-on: https://chromium-review.googlesource.com/740945Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513227}