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This reverts commit a64eb942.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Implement OnNetworkChangeObserver interface on SmbService
> 
> - Implements Net::NetworkChangeNotifier::NetworkChangeObserver to
>   SmbService.
> - Optimizes the workflow of host name resolution by calling on host
>   discovery whenever a network change is discovered, rather than
>   only running host discovery on an error returned by
>   StartReadDirectory.
> 
> Bug: 922273
> Test: manual end to end
> Change-Id: I6544c169fb1aa91ebd7d19fe22d854930ae4a928
> Reviewed-on: https://chromium-review.googlesource.com/c/1464651
> Commit-Queue: jimmy gong <jimmyxgong@chromium.org>
> Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
> Reviewed-by: Bailey Berro <baileyberro@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#634431}

TBR=zentaro@chromium.org,baileyberro@chromium.org,jimmyxgong@chromium.org

Change-Id: Ic731025eafe9fed7c33e6fdf61f56553ba502e81
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 922273
Reviewed-on: https://chromium-review.googlesource.com/c/1482718Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: jimmy gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634755}