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

webrtc/base/sslidentity.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 @@
 // implementations.
 
 // A somewhat opaque type used to encapsulate a certificate.
 // Wraps the SSL library's notion of a certificate, with reference counting.
 // The SSLCertificate object is pretty much immutable once created.
 // (The OpenSSL implementation only does reference counting and
 // possibly caching of intermediate results.)
 class SSLCertificate {
  public:
   // Parses and builds a certificate from a PEM encoded string.
-  // Returns NULL on failure.
+  // Returns null on failure.
   // The length of the string representation of the certificate is
-  // stored in *pem_length if it is non-NULL, and only if
+  // stored in *pem_length if it is non-null, and only if
   // parsing was successful.
   // Caller is responsible for freeing the returned object.
   static SSLCertificate* FromPEMString(const std::string& pem_string);
   virtual ~SSLCertificate() {}
 
   // Returns a new SSLCertificate object instance wrapping the same
   // underlying certificate, including its chain if present.
   // Caller is responsible for freeing the returned object.
   virtual SSLCertificate* GetReference() const = 0;
 
@@ skipping 142 matching lines @@
 // with the same public key).
 // This too is pretty much immutable once created.
 class SSLIdentity {
  public:
   // Generates an identity (keypair and self-signed certificate). If
   // |common_name| is non-empty, it will be used for the certificate's subject
   // and issuer name, otherwise a random string will be used. The key type and
   // parameters are defined in |key_param|. The certificate's lifetime in
   // seconds from the current time is defined in |certificate_lifetime|; it
   // should be a non-negative number.
-  // Returns NULL on failure.
+  // Returns null on failure.
   // Caller is responsible for freeing the returned object.
   static SSLIdentity* GenerateWithExpiration(const std::string& common_name,
                                              const KeyParams& key_param,
                                              time_t certificate_lifetime);
   static SSLIdentity* Generate(const std::string& common_name,
                                const KeyParams& key_param);
   static SSLIdentity* Generate(const std::string& common_name,
                                KeyType key_type);
 
   // Generates an identity with the specified validity period.
@@ skipping 35 matching lines @@
 // |s| is not 0-terminated; its char count is defined by |length|.
 int64_t ASN1TimeToSec(const unsigned char* s, size_t length, bool long_format);
 
 extern const char kPemTypeCertificate[];
 extern const char kPemTypeRsaPrivateKey[];
 extern const char kPemTypeEcPrivateKey[];
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_SSLIDENTITY_H_