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

mojo/public/cpp/system/data_pipe.h

 // 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.
 
 #ifndef MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
 #define MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
 
 #include <assert.h>
 
 #include "mojo/public/c/system/data_pipe.h"
@@ skipping 102 matching lines @@
   DataPipe();
   explicit DataPipe(const MojoCreateDataPipeOptions& options);
   ~DataPipe();
 
   ScopedDataPipeProducerHandle producer_handle;
   ScopedDataPipeConsumerHandle consumer_handle;
 };
 
 inline DataPipe::DataPipe() {
   MojoResult result MOJO_ALLOW_UNUSED =
-      CreateDataPipe(NULL, &producer_handle, &consumer_handle);
+      CreateDataPipe(nullptr, &producer_handle, &consumer_handle);
   assert(result == MOJO_RESULT_OK);
 }
 
 inline DataPipe::DataPipe(const MojoCreateDataPipeOptions& options) {
   MojoResult result MOJO_ALLOW_UNUSED =
       CreateDataPipe(&options, &producer_handle, &consumer_handle);
   assert(result == MOJO_RESULT_OK);
 }
 
 inline DataPipe::~DataPipe() {
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_