Run clang-modernize -use-nullptr over src/extensions/.

extensions/browser/api/serial/serial_connection.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 "extensions/browser/api/serial/serial_connection.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
@@ skipping 346 matching lines @@
 
 void SerialConnection::OnAsyncReadComplete(int bytes_read,
                                            device::serial::ReceiveError error) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!receive_complete_.is_null());
   ReceiveCompleteCallback callback = receive_complete_;
   receive_complete_.Reset();
   receive_timeout_task_.reset();
   callback.Run(std::string(receive_buffer_->data(), bytes_read),
                ConvertReceiveErrorFromMojo(error));
-  receive_buffer_ = NULL;
+  receive_buffer_ = nullptr;
 }
 
 void SerialConnection::OnAsyncWriteComplete(int bytes_sent,
                                             device::serial::SendError error) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!send_complete_.is_null());
   SendCompleteCallback callback = send_complete_;
   send_complete_.Reset();
   send_timeout_task_.reset();
   callback.Run(bytes_sent, ConvertSendErrorFromMojo(error));
@@ skipping 50 matching lines @@
   output->parity_bit = extensions::ConvertParityBitToMojo(input.parity_bit);
   output->stop_bits = extensions::ConvertStopBitsToMojo(input.stop_bits);
   if (input.cts_flow_control.get()) {
     output->has_cts_flow_control = true;
     output->cts_flow_control = *input.cts_flow_control;
   }
   return output.Pass();
 }
 
 }  // namespace mojo