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

components/sync/protocol/proto_value_conversions_unittest.cc

 // Copyright (c) 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.
 
 // Keep this file in sync with the .proto files in this directory.
 
 #include "components/sync/protocol/proto_value_conversions.h"
 
 #include <string>
 
@@ skipping 342 matching lines @@
   EXPECT_EQ(MODEL_TYPE_COUNT - FIRST_REAL_MODEL_TYPE -
                 (LAST_PROXY_TYPE - FIRST_PROXY_TYPE + 1),
             static_cast<int>(value->size()));
 }
 
 namespace {
 // Returns whether the given value has specifics under the entries in the given
 // path.
 bool ValueHasSpecifics(const base::DictionaryValue& value,
                        const std::string& path) {
-  const base::ListValue* entities_list = NULL;
-  const base::DictionaryValue* entry_dictionary = NULL;
-  const base::DictionaryValue* specifics_dictionary = NULL;
+  const base::ListValue* entities_list = nullptr;
+  const base::DictionaryValue* entry_dictionary = nullptr;
+  const base::DictionaryValue* specifics_dictionary = nullptr;
 
   if (!value.GetList(path, &entities_list))
     return false;
 
   if (!entities_list->GetDictionary(0, &entry_dictionary))
     return false;
 
   return entry_dictionary->GetDictionary("specifics", &specifics_dictionary);
 }
 }  // namespace
@@ skipping 39 matching lines @@
   EXPECT_FALSE(ValueHasSpecifics(*(value_without_specifics.get()),
                                  "get_updates.entries"));
 }
 
 TEST_F(ProtoValueConversionsTest, AttachmentIdProtoToValue) {
   TestSpecificsToValue(AttachmentIdProtoToValue);
 }
 
 }  // namespace
 }  // namespace syncer