Replace NULL with nullptr in all C++ files.

webrtc/pc/datachannel.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 99 matching lines @@
 }
 
 rtc::scoped_refptr<DataChannel> DataChannel::Create(
     DataChannelProviderInterface* provider,
     cricket::DataChannelType dct,
     const std::string& label,
     const InternalDataChannelInit& config) {
   rtc::scoped_refptr<DataChannel> channel(
       new rtc::RefCountedObject<DataChannel>(provider, dct, label));
   if (!channel->Init(config)) {
-    return NULL;
+    return nullptr;
   }
   return channel;
 }
 
 DataChannel::DataChannel(
     DataChannelProviderInterface* provider,
     cricket::DataChannelType dct,
     const std::string& label)
     : label_(label),
       observer_(nullptr),
@@ skipping 54 matching lines @@
     // Try to connect to the transport in case the transport channel already
     // exists.
     OnTransportChannelCreated();
 
     // Checks if the transport is ready to send because the initial channel
     // ready signal may have been sent before the DataChannel creation.
     // This has to be done async because the upper layer objects (e.g.
     // Chrome glue and WebKit) are not wired up properly until after this
     // function returns.
     if (provider_->ReadyToSendData()) {
-      rtc::Thread::Current()->Post(RTC_FROM_HERE, this, MSG_CHANNELREADY, NULL);
+      rtc::Thread::Current()->Post(RTC_FROM_HERE, this, MSG_CHANNELREADY,
+                                   nullptr);
     }
   }
 
   return true;
 }
 
 DataChannel::~DataChannel() {}
 
 void DataChannel::RegisterObserver(DataChannelObserver* observer) {
   observer_ = observer;
   DeliverQueuedReceivedData();
 }
 
 void DataChannel::UnregisterObserver() {
-  observer_ = NULL;
+  observer_ = nullptr;
 }
 
 bool DataChannel::reliable() const {
   if (data_channel_type_ == cricket::DCT_RTP) {
     return false;
   } else {
     return config_.maxRetransmits == -1 &&
            config_.maxRetransmitTime == -1;
   }
 }
@@ skipping 422 matching lines @@
     QueueControlMessage(buffer);
   } else {
     LOG(LS_ERROR) << "Closing the DataChannel due to a failure to send"
                   << " the CONTROL message, send_result = " << send_result;
     Close();
   }
   return retval;
 }
 
 }  // namespace webrtc