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Similar logic is currently duplicated between DnsConfigServiceWin and
DnsConfigServicePosix, and there would be even more duplication if
DCSPosix is further split by platforms (as I intend to do in a
subsequent CL).

Some logic for handling the detected-change notifications also moved
from the (now-shared) Watcher to DnsConfigService, as the logic wasn't
really part of "watching" but more handling.

Bug: 1157492
Change-Id: Ie813e5d9085cb4a109f7cad9b28d351562352b2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616421Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842578}