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

net/quic/quic_data_writer.h

Index: net/quic/quic_data_writer.h
diff --git a/net/quic/quic_data_writer.h b/net/quic/quic_data_writer.h
index 0e14e87c692dcbee6b19bb65ad7a74ce610f531e..8204c3af2c24bf4ed0c4fe40b3eac07e15f65b2f 100644
--- a/net/quic/quic_data_writer.h
+++ b/net/quic/quic_data_writer.h
@@ -66,9 +66,9 @@ class NET_EXPORT_PRIVATE QuicDataWriter {
   }
 
  private:
-  // Returns the location that the data should be written at, or NULL if there
-  // is not enough room. Call EndWrite with the returned offset and the given
-  // length to pad out for the next write.
+  // Returns the location that the data should be written at, or nullptr if
+  // there is not enough room. Call EndWrite with the returned offset and the
+  // given length to pad out for the next write.
   char* BeginWrite(size_t length);
 
   char* buffer_;