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

webrtc/api/jsepsessiondescription.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 17 matching lines @@
 }
 
 namespace webrtc {
 
 // Implementation of SessionDescriptionInterface.
 class JsepSessionDescription : public SessionDescriptionInterface {
  public:
   explicit JsepSessionDescription(const std::string& type);
   virtual ~JsepSessionDescription();
 
-  // |error| may be NULL.
+  // |error| may be null.
   bool Initialize(const std::string& sdp, SdpParseError* error);
 
   // Takes ownership of |description|.
   // TODO(deadbeef): Make this use an std::unique_ptr<>, so ownership logic is
   // more clear.
   bool Initialize(cricket::SessionDescription* description,
       const std::string& session_id,
       const std::string& session_version);
 
   virtual cricket::SessionDescription* description() {
@@ skipping 34 matching lines @@
   bool GetMediasectionIndex(const IceCandidateInterface* candidate,
                             size_t* index);
   int GetMediasectionIndex(const cricket::Candidate& candidate);
 
   RTC_DISALLOW_COPY_AND_ASSIGN(JsepSessionDescription);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_JSEPSESSIONDESCRIPTION_H_