Revert of Add Mojo interfaces for out-of-process proxy resolver. (patchset #4 id...

Revert of Add Mojo interfaces for out-of-process proxy resolver. (patchset #4 id:60001 of https://codereview.chromium.org/900433003/)

Reason for revert:
http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29/builds/38575
Broke device_unittests device_unittests SerialConnectionTest.Cancel it seems.

Original issue's description:
> Add Mojo interfaces for out-of-process proxy resolver.
>
> See:
> https://docs.google.com/a/chromium.org/document/d/1n5hr4KJhZl2A4MicTfmyiHPdiKp7kmUoWXnRBN8SrZE/edit#
>
> BUG=11746
>
> Committed: https://crrev.com/073e42bb7587b90594e5799fb6a4afe08a1e1561
> Cr-Commit-Position: refs/heads/master@{#314509}

TBR=rdsmith@chromium.org,eroman@chromium.org,sammc@chromium.org,amistry@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=11746

Review URL: https://codereview.chromium.org/892373006

Cr-Commit-Position: refs/heads/master@{#314519}