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

net/quic/quic_data_stream.cc

Index: net/quic/quic_data_stream.cc
diff --git a/net/quic/quic_data_stream.cc b/net/quic/quic_data_stream.cc
index 7963f4f41ebcd572166c4e89120c09d0ae398c14..aac58f9e10760eed85c130c463ed165829869bdd 100644
--- a/net/quic/quic_data_stream.cc
+++ b/net/quic/quic_data_stream.cc
@@ -29,7 +29,7 @@ QuicPriority kDefaultPriority = 3;
 QuicDataStream::QuicDataStream(QuicStreamId id,
                                QuicSession* session)
     : ReliableQuicStream(id, session),
-      visitor_(NULL),
+      visitor_(nullptr),
       headers_decompressed_(false),
       priority_(kDefaultPriority),
       decompression_failed_(false),
@@ -175,7 +175,7 @@ void QuicDataStream::OnClose() {
     Visitor* visitor = visitor_;
     // Calling Visitor::OnClose() may result the destruction of the visitor,
     // so we need to ensure we don't call it again.
-    visitor_ = NULL;
+    visitor_ = nullptr;
     visitor->OnClose(this);
   }
 }