Mojo: NULL -> nullptr in mojo/system and mojo/embedder.

mojo/system/data_pipe_producer_dispatcher.cc

 // Copyright 2013 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/system/data_pipe_producer_dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/system/data_pipe.h"
 #include "mojo/system/memory.h"
 
@@ skipping 18 matching lines @@
 }
 
 void DataPipeProducerDispatcher::CancelAllWaitersNoLock() {
   lock().AssertAcquired();
   data_pipe_->ProducerCancelAllWaiters();
 }
 
 void DataPipeProducerDispatcher::CloseImplNoLock() {
   lock().AssertAcquired();
   data_pipe_->ProducerClose();
-  data_pipe_ = NULL;
+  data_pipe_ = nullptr;
 }
 
 scoped_refptr<Dispatcher>
 DataPipeProducerDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
   lock().AssertAcquired();
 
   scoped_refptr<DataPipeProducerDispatcher> rv =
       new DataPipeProducerDispatcher();
   rv->Init(data_pipe_);
-  data_pipe_ = NULL;
+  data_pipe_ = nullptr;
   return scoped_refptr<Dispatcher>(rv.get());
 }
 
 MojoResult DataPipeProducerDispatcher::WriteDataImplNoLock(
     UserPointer<const void> elements,
     UserPointer<uint32_t> num_bytes,
     MojoWriteDataFlags flags) {
   lock().AssertAcquired();
   return data_pipe_->ProducerWriteData(
       elements, num_bytes, (flags & MOJO_WRITE_DATA_FLAG_ALL_OR_NONE));
@@ skipping 38 matching lines @@
   data_pipe_->ProducerRemoveWaiter(waiter, signals_state);
 }
 
 bool DataPipeProducerDispatcher::IsBusyNoLock() const {
   lock().AssertAcquired();
   return data_pipe_->ProducerIsBusy();
 }
 
 }  // namespace system
 }  // namespace mojo