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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).

As HOSTS-reading logic is so similar between platforms, the base
implementation is now able to do everything for the Posix platforms with
just a simple constructor param to set the file location, and only
minimal overriding is needed for Windows.

Bug: 1157492
Change-Id: I1051580c891b8c86f46ac6d0b68f89c7b60244b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625348
Commit-Queue: Eric Orth <ericorth@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843254}