Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/asynctcpsocket.h

 /*
  *  Copyright 2004 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 33 matching lines @@
   int Close() override;
 
   State GetState() const override;
   int GetOption(Socket::Option opt, int* value) override;
   int SetOption(Socket::Option opt, int value) override;
   int GetError() const override;
   void SetError(int error) override;
 
  protected:
   // Binds and connects |socket| and creates AsyncTCPSocket for
-  // it. Takes ownership of |socket|. Returns NULL if bind() or
+  // it. Takes ownership of |socket|. Returns null if bind() or
   // connect() fail (|socket| is destroyed in that case).
   static AsyncSocket* ConnectSocket(AsyncSocket* socket,
                                     const SocketAddress& bind_address,
                                     const SocketAddress& remote_address);
   virtual int SendRaw(const void* pv, size_t cb);
   int FlushOutBuffer();
   // Add data to |outbuf_|.
   void AppendToOutBuffer(const void* pv, size_t cb);
 
   // Helper methods for |outpos_|.
@@ skipping 13 matching lines @@
   Buffer outbuf_;
   size_t max_insize_;
   size_t max_outsize_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(AsyncTCPSocketBase);
 };
 
 class AsyncTCPSocket : public AsyncTCPSocketBase {
  public:
   // Binds and connects |socket| and creates AsyncTCPSocket for
-  // it. Takes ownership of |socket|. Returns NULL if bind() or
+  // it. Takes ownership of |socket|. Returns null if bind() or
   // connect() fail (|socket| is destroyed in that case).
   static AsyncTCPSocket* Create(AsyncSocket* socket,
                                 const SocketAddress& bind_address,
                                 const SocketAddress& remote_address);
   AsyncTCPSocket(AsyncSocket* socket, bool listen);
   ~AsyncTCPSocket() override {}
 
   int Send(const void* pv,
            size_t cb,
            const rtc::PacketOptions& options) override;
   void ProcessInput(char* data, size_t* len) override;
   void HandleIncomingConnection(AsyncSocket* socket) override;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(AsyncTCPSocket);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_ASYNCTCPSOCKET_H_