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

webrtc/api/peerconnectioninterface.h

 /*
  *  Copyright 2012 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 514 matching lines @@
       std::vector<MediaStreamInterface*> streams) {
     return nullptr;
   }
 
   // Remove an RtpSender from this PeerConnection.
   // Returns true on success.
   virtual bool RemoveTrack(RtpSenderInterface* sender) {
     return false;
   }
 
-  // Returns pointer to a DtmfSender on success. Otherwise returns NULL.
+  // Returns pointer to a DtmfSender on success. Otherwise returns null.
   //
   // This API is no longer part of the standard; instead DtmfSenders are
   // obtained from RtpSenders. Which is what the implementation does; it finds
   // an RtpSender for |track| and just returns its DtmfSender.
   virtual rtc::scoped_refptr<DtmfSenderInterface> CreateDtmfSender(
       AudioTrackInterface* track) = 0;
 
   // TODO(deadbeef): Make these pure virtual once all subclasses implement them.
 
   // Creates a sender without a track. Can be used for "early media"/"warmup"
@@ skipping 369 matching lines @@
   // platform-specific capturers, but these should be refactored to use
   // VideoTrackSourceInterface directly.
   // TODO(deadbeef): Make pure virtual once downstream mock PC factory classes
   // are updated.
   virtual rtc::scoped_refptr<VideoTrackSourceInterface> CreateVideoSource(
       std::unique_ptr<cricket::VideoCapturer> capturer) {
     return nullptr;
   }
 
   // A video source creator that allows selection of resolution and frame rate.
-  // |constraints| decides video resolution and frame rate but can be NULL.
-  // In the NULL case, use the version above.
+  // |constraints| decides video resolution and frame rate but can be null.
+  // In the null case, use the version above.
   //
   // |constraints| is only used for the invocation of this method, and can
   // safely be destroyed afterwards.
   virtual rtc::scoped_refptr<VideoTrackSourceInterface> CreateVideoSource(
       std::unique_ptr<cricket::VideoCapturer> capturer,
       const MediaConstraintsInterface* constraints) {
     return nullptr;
   }
 
   // Deprecated; please use the versions that take unique_ptrs above.
   // TODO(deadbeef): Remove these once safe to do so.
   virtual rtc::scoped_refptr<VideoTrackSourceInterface> CreateVideoSource(
       cricket::VideoCapturer* capturer) {
     return CreateVideoSource(std::unique_ptr<cricket::VideoCapturer>(capturer));
   }
   virtual rtc::scoped_refptr<VideoTrackSourceInterface> CreateVideoSource(
       cricket::VideoCapturer* capturer,
       const MediaConstraintsInterface* constraints) {
     return CreateVideoSource(std::unique_ptr<cricket::VideoCapturer>(capturer),
                              constraints);
   }
 
   // Creates a new local VideoTrack. The same |source| can be used in several
   // tracks.
   virtual rtc::scoped_refptr<VideoTrackInterface> CreateVideoTrack(
       const std::string& label,
       VideoTrackSourceInterface* source) = 0;
 
-  // Creates an new AudioTrack. At the moment |source| can be NULL.
+  // Creates an new AudioTrack. At the moment |source| can be null.
   virtual rtc::scoped_refptr<AudioTrackInterface>
       CreateAudioTrack(const std::string& label,
                        AudioSourceInterface* source) = 0;
 
   // Starts AEC dump using existing file. Takes ownership of |file| and passes
   // it on to VoiceEngine (via other objects) immediately, which will take
   // the ownerhip. If the operation fails, the file will be closed.
   // A maximum file size in bytes can be specified. When the file size limit is
   // reached, logging is stopped automatically. If max_size_bytes is set to a
   // value <= 0, no limit will be used, and logging will continue until the
@@ skipping 137 matching lines @@
     cricket::WebRtcVideoEncoderFactory* encoder_factory,
     cricket::WebRtcVideoDecoderFactory* decoder_factory) {
   return CreatePeerConnectionFactory(
       worker_and_network_thread, worker_and_network_thread, signaling_thread,
       default_adm, encoder_factory, decoder_factory);
 }
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_PEERCONNECTIONINTERFACE_H_