Replace NULL with nullptr in all C++ files.

webrtc/p2p/base/jseptransport.cc

 /*
  *  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 295 matching lines @@
     std::string* error_desc) const {
   if (!fingerprint) {
     return BadTransportDescription("No fingerprint.", error_desc);
   }
   if (!certificate) {
     return BadTransportDescription(
         "Fingerprint provided but no identity available.", error_desc);
   }
   std::unique_ptr<rtc::SSLFingerprint> fp_tmp(rtc::SSLFingerprint::Create(
       fingerprint->algorithm, certificate->identity()));
-  RTC_DCHECK(fp_tmp.get() != NULL);
+  RTC_DCHECK(fp_tmp.get() != nullptr);
   if (*fp_tmp == *fingerprint) {
     return true;
   }
   std::ostringstream desc;
   desc << "Local fingerprint does not match identity. Expected: ";
   desc << fp_tmp->ToString();
   desc << " Got: " << fingerprint->ToString();
   return BadTransportDescription(desc.str(), error_desc);
 }
 
@@ skipping 156 matching lines @@
     }
 
     // If local is passive, local will act as server.
   }
 
   *ssl_role = is_remote_server ? rtc::SSL_CLIENT : rtc::SSL_SERVER;
   return true;
 }
 
 }  // namespace cricket