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

mojo/system/data_pipe_consumer_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_consumer_dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/system/data_pipe.h"
 #include "mojo/system/memory.h"
 
@@ skipping 18 matching lines @@
 }
 
 void DataPipeConsumerDispatcher::CancelAllWaitersNoLock() {
   lock().AssertAcquired();
   data_pipe_->ConsumerCancelAllWaiters();
 }
 
 void DataPipeConsumerDispatcher::CloseImplNoLock() {
   lock().AssertAcquired();
   data_pipe_->ConsumerClose();
-  data_pipe_ = NULL;
+  data_pipe_ = nullptr;
 }
 
 scoped_refptr<Dispatcher>
 DataPipeConsumerDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
   lock().AssertAcquired();
 
   scoped_refptr<DataPipeConsumerDispatcher> rv =
       new DataPipeConsumerDispatcher();
   rv->Init(data_pipe_);
-  data_pipe_ = NULL;
+  data_pipe_ = nullptr;
   return scoped_refptr<Dispatcher>(rv.get());
 }
 
 MojoResult DataPipeConsumerDispatcher::ReadDataImplNoLock(
     UserPointer<void> elements,
     UserPointer<uint32_t> num_bytes,
     MojoReadDataFlags flags) {
   lock().AssertAcquired();
 
   if ((flags & MOJO_READ_DATA_FLAG_DISCARD)) {
@@ skipping 61 matching lines @@
   data_pipe_->ConsumerRemoveWaiter(waiter, signals_state);
 }
 
 bool DataPipeConsumerDispatcher::IsBusyNoLock() const {
   lock().AssertAcquired();
   return data_pipe_->ConsumerIsBusy();
 }
 
 }  // namespace system
 }  // namespace mojo