Replace NULL with nullptr in all C++ files.

webrtc/p2p/base/relayport_unittest.cc

 /*
  *  Copyright 2009 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 194 matching lines @@
     // Should be the SSLTCP address.
     EXPECT_TRUE(relay_server_->HasConnection(kRelaySslAddr));
   }
 
  private:
   rtc::AsyncUDPSocket* CreateAsyncUdpSocket(const SocketAddress addr) {
     rtc::AsyncSocket* socket =
         virtual_socket_server_->CreateAsyncSocket(SOCK_DGRAM);
     rtc::AsyncUDPSocket* packet_socket =
         rtc::AsyncUDPSocket::Create(socket, addr);
-    EXPECT_TRUE(packet_socket != NULL);
+    EXPECT_TRUE(packet_socket != nullptr);
     packet_socket->SignalReadPacket.connect(this, &RelayPortTest::OnReadPacket);
     return packet_socket;
   }
 
   rtc::AsyncSocket* CreateServerSocket(const SocketAddress addr) {
     rtc::AsyncSocket* socket =
         virtual_socket_server_->CreateAsyncSocket(SOCK_STREAM);
     EXPECT_GE(socket->Bind(addr), 0);
     EXPECT_GE(socket->Listen(5), 0);
     return socket;
@@ skipping 40 matching lines @@
   TestConnectUdp();
 }
 
 TEST_F(RelayPortTest, ConnectTcp) {
   TestConnectTcp();
 }
 
 TEST_F(RelayPortTest, ConnectSslTcp) {
   TestConnectSslTcp();
 }