[Sync] Replacing NULL with nullptr in code and null in comments for components/sync/

components/sync/syncable/nigori_util.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync/syncable/nigori_util.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 155 matching lines @@
     return false;
   }
   if ((!SpecificsNeedsEncryption(encrypted_types, new_specifics) &&
        !was_encrypted) ||
       !cryptographer || !cryptographer->is_initialized()) {
     // No encryption required or we are unable to encrypt.
     generated_specifics.CopyFrom(new_specifics);
   } else {
     // Encrypt new_specifics into generated_specifics.
     if (VLOG_IS_ON(2)) {
-      std::unique_ptr<base::DictionaryValue> value(entry->ToValue(NULL));
+      std::unique_ptr<base::DictionaryValue> value(entry->ToValue(nullptr));
       std::string info;
       base::JSONWriter::WriteWithOptions(
           *value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &info);
       DVLOG(2) << "Encrypting specifics of type " << ModelTypeToString(type)
                << " with content: " << info;
     }
     // Only copy over the old specifics if it is of the right type and already
     // encrypted. The first time we encrypt a node we start from scratch, hence
     // removing all the unencrypted data, but from then on we only want to
     // update the node if the data changes or the encryption key changes.
@@ skipping 135 matching lines @@
     encrypted_types.Put(ARC_PACKAGE);
   if (nigori.encrypt_printers())
     encrypted_types.Put(PRINTERS);
   if (nigori.encrypt_reading_list())
     encrypted_types.Put(READING_LIST);
   return encrypted_types;
 }
 
 }  // namespace syncable
 }  // namespace syncer