QUIC - (no behavior change) s/NULL/nullptr/g in .../quic/...

net/quic/quic_ack_notifier_manager.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 "net/quic/quic_ack_notifier_manager.h"
 
 #include <stddef.h>
 #include <list>
 #include <map>
 #include <utility>
@@ skipping 68 matching lines @@
 
   RetransmittableFrames* frames = serialized_packet.retransmittable_frames;
 
   // AckNotifiers can only be attached to retransmittable frames.
   if (!frames) {
     return;
   }
 
   for (QuicFrames::const_iterator it = frames->frames().begin();
        it != frames->frames().end(); ++it) {
-    if (it->type == STREAM_FRAME && it->stream_frame->notifier != NULL) {
+    if (it->type == STREAM_FRAME && it->stream_frame->notifier != nullptr) {
       QuicAckNotifier* notifier = it->stream_frame->notifier;
 
       // The AckNotifier needs to know it is tracking this packet's sequence
       // number.
       notifier->AddSequenceNumber(serialized_packet.sequence_number,
                                   serialized_packet.packet->length());
 
       // Update the mapping in the other direction, from sequence
       // number to AckNotifier.
       ack_notifier_map_[serialized_packet.sequence_number].insert(notifier);
 
       // Take ownership of the AckNotifier.
       ack_notifiers_.insert(notifier);
     }
   }
 }
 
 }  // namespace net