Replace NULL with nullptr.

extensions/browser/api/cast_channel/cast_auth_util_nss.cc

Index: extensions/browser/api/cast_channel/cast_auth_util_nss.cc
diff --git a/extensions/browser/api/cast_channel/cast_auth_util_nss.cc b/extensions/browser/api/cast_channel/cast_auth_util_nss.cc
index 97f16d7c8e04fb3f20568d0ec81748b80cd7609c..dede4d0e80818a3c60b2d0aeb9b5bfdca9a9bc68 100644
--- a/extensions/browser/api/cast_channel/cast_auth_util_nss.cc
+++ b/extensions/browser/api/cast_channel/cast_auth_util_nss.cc
@@ -77,7 +77,7 @@ AuthResult VerifyCredentials(const AuthResponse& response,
 
   // Parse into a certificate structure.
   ScopedCERTCertificate cert(CERT_NewTempCertificate(
-      CERT_GetDefaultCertDB(), &der_cert, NULL, PR_FALSE, PR_TRUE));
+      CERT_GetDefaultCertDB(), &der_cert, nullptr, PR_FALSE, PR_TRUE));
   if (!cert.get()) {
     return AuthResult::CreateWithNSSError(
         "Failed to parse certificate.",
@@ -96,7 +96,7 @@ AuthResult VerifyCredentials(const AuthResponse& response,
         AuthResult::ERROR_CERT_PARSING_FAILED, PORT_GetError());
   }
   SECStatus verified = CERT_VerifySignedDataWithPublicKey(
-      &cert->signatureWrap, ca_public_key.get(), NULL);
+      &cert->signatureWrap, ca_public_key.get(), nullptr);
   if (verified != SECSuccess) {
     return AuthResult::CreateWithNSSError(
         "Cert not signed by trusted CA",
@@ -119,11 +119,8 @@ AuthResult VerifyCredentials(const AuthResponse& response,
   signature_item.len = signature.length();
   verified = VFY_VerifyDataDirect(
       reinterpret_cast<unsigned char*>(const_cast<char*>(peer_cert.data())),
-      peer_cert.size(),
-      public_key.get(),
-      &signature_item,
-      SEC_OID_PKCS1_RSA_ENCRYPTION,
-      SEC_OID_SHA1, NULL, NULL);
+      peer_cert.size(), public_key.get(), &signature_item,
+      SEC_OID_PKCS1_RSA_ENCRYPTION, SEC_OID_SHA1, nullptr, nullptr);
 
   if (verified != SECSuccess) {
     return AuthResult::CreateWithNSSError(