Eliminate mojo::Shell client lib class

mojo/services/network/tcp_server_socket_impl.h

Index: mojo/services/network/tcp_server_socket_impl.h
diff --git a/mojo/services/network/tcp_server_socket_impl.h b/mojo/services/network/tcp_server_socket_impl.h
index 5149cb128d62d754ffa2251c26a3bd1c810c2465..2078cecfe7513bf305d49bb132564d0d37e17426 100644
--- a/mojo/services/network/tcp_server_socket_impl.h
+++ b/mojo/services/network/tcp_server_socket_impl.h
@@ -8,7 +8,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/services/network/public/interfaces/tcp_server_socket.mojom.h"
-#include "mojo/shell/public/cpp/shell.h"
+#include "mojo/shell/public/cpp/message_loop_ref.h"
 #include "net/base/ip_endpoint.h"
 #include "net/socket/tcp_socket.h"
 
@@ -20,7 +20,7 @@ class TCPServerSocketImpl : public TCPServerSocket {
 
   // Passed ownership of a socket already in listening mode.
   TCPServerSocketImpl(scoped_ptr<net::TCPSocket> socket,
-                      scoped_ptr<mojo::AppRefCount> app_refcount,
+                      scoped_ptr<mojo::MessageLoopRef> app_refcount,
                       InterfaceRequest<TCPServerSocket> request);
   ~TCPServerSocketImpl() override;
 
@@ -47,7 +47,7 @@ class TCPServerSocketImpl : public TCPServerSocket {
   scoped_ptr<net::TCPSocket> accepted_socket_;
   net::IPEndPoint accepted_address_;
 
-  scoped_ptr<mojo::AppRefCount> app_refcount_;
+  scoped_ptr<mojo::MessageLoopRef> app_refcount_;
   StrongBinding<TCPServerSocket> binding_;
 };