Introduce internal::ServiceRegistry to prepare for ServiceProvider split.

mojo/public/cpp/application/lib/service_connector.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/application/lib/service_connector.h"
 
 namespace mojo {
 namespace internal {
 
-ServiceConnectorBase::Owner::Owner() {}
-
-ServiceConnectorBase::Owner::Owner(
-    ScopedMessagePipeHandle service_provider_handle) {
-  service_provider_.Bind(service_provider_handle.Pass());
-  service_provider_.set_client(this);
+ServiceConnectorBase::ServiceConnectorBase(const std::string& name)
+    : name_(name),
+      registry_(NULL) {
 }
 
-ServiceConnectorBase::Owner::~Owner() {}
-
 ServiceConnectorBase::~ServiceConnectorBase() {}
 
 }  // namespace internal
 }  // namespace mojo