Revert 187554 "Implement IPC::ChannelFactory, a class that accep..."

Revert 187554 "Implement IPC::ChannelFactory, a class that accep..."

Reverting because it seems to cause failures on ipc_tests
(UnixDomainSocketUtil.Connect, UnixDomainSocketUtil.SendReceive) on Android.

> Implement IPC::ChannelFactory, a class that accept()s on a UNIX socket.
>
> IPC::ChannelFactory listens on a UNIX domain socket and notifies its delegate
> when a client connects. The delegate is expected to craft an IPC::Channel from
> the handle it is given.
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=186912
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=187233
>
> Review URL: https://chromiumcodereview.appspot.com/12386010

TBR=jeremya@chromium.org
Review URL: https://codereview.chromium.org/12431017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187760 0039d316-1c4b-4281-b951-d872f2087c98