Mojo: NULL -> nullptr in mojo/public/cpp outside of bindings.

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::ServiceConnectorBase(const std::string& name)
     : name_(name),
-      application_connection_(NULL) {
+      application_connection_(nullptr) {
 }
 
 ServiceConnectorBase::~ServiceConnectorBase() {}
 
 }  // namespace internal
 }  // namespace mojo