Implement IPC::ChannelFactory, a class that accept()s on a UNIX socket.

ipc/ipc_channel_proxy.cc

Index: ipc/ipc_channel_proxy.cc
diff --git a/ipc/ipc_channel_proxy.cc b/ipc/ipc_channel_proxy.cc
index 0202e9e27ef665d13fe5dc30c01737fe5aaa1106..1048310ea7088c41070390fe33858f885c36f8ff 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -414,13 +414,13 @@ int ChannelProxy::TakeClientFileDescriptor() {
   return channel->TakeClientFileDescriptor();
 }
 
-bool ChannelProxy::GetClientEuid(uid_t* client_euid) const {
+bool ChannelProxy::GetPeerEuid(uid_t* peer_euid) const {
   DCHECK(CalledOnValidThread());
 
   Channel* channel = context_.get()->channel_.get();
   // Channel must have been created first.
   DCHECK(channel) << context_.get()->channel_id_;
-  return channel->GetClientEuid(client_euid);
+  return channel->GetPeerEuid(peer_euid);
 }
 #endif