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

webrtc/base/httpcommon-inl.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 35 matching lines @@
 void Url<CTYPE>::do_set_address(const CTYPE* val, size_t len) {
   if (const CTYPE* at = strchrn(val, len, static_cast<CTYPE>('@'))) {
     // Everything before the @ is a user:password combo, so skip it.
     len -= at - val + 1;
     val = at + 1;
   }
   if (const CTYPE* colon = strchrn(val, len, static_cast<CTYPE>(':'))) {
     host_.assign(val, colon - val);
     // Note: In every case, we're guaranteed that colon is followed by a null,
     // or non-numeric character.
-    port_ = static_cast<uint16_t>(::strtoul(colon + 1, NULL, 10));
+    port_ = static_cast<uint16_t>(::strtoul(colon + 1, nullptr, 10));
     // TODO: Consider checking for invalid data following port number.
   } else {
     host_.assign(val, len);
     port_ = HttpDefaultPort(secure_);
   }
 }
 
 template<class CTYPE>
 void Url<CTYPE>::do_set_full_path(const CTYPE* val, size_t len) {
   const CTYPE* query = strchrn(val, len, static_cast<CTYPE>('?'));
@@ skipping 56 matching lines @@
   }
   value->assign(query_.substr(pos, end - pos));
   return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_HTTPCOMMON_INL_H__