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

components/sync/test/fake_server/fake_server_verifier.cc

 // Copyright 2014 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/test/fake_server/fake_server_verifier.h"
 
 #include <map>
 #include <memory>
 #include <set>
 #include <vector>
@@ skipping 59 matching lines @@
 AssertionResult FakeServerVerifier::VerifyEntityCountByType(
     size_t expected_count,
     syncer::ModelType model_type) const {
   std::unique_ptr<base::DictionaryValue> entities =
       fake_server_->GetEntitiesAsDictionaryValue();
   if (!entities.get()) {
     return DictionaryCreationAssertionFailure();
   }
 
   string model_type_string = ModelTypeToString(model_type);
-  base::ListValue* entity_list = NULL;
+  base::ListValue* entity_list = nullptr;
   if (!entities->GetList(model_type_string, &entity_list)) {
     return UnknownTypeAssertionFailure(model_type_string);
   } else if (expected_count != entity_list->GetSize()) {
     return VerificationCountAssertionFailure(entity_list->GetSize(),
                                              expected_count)
            << "\n\n"
            << ConvertFakeServerContentsToString(*entities);
   }
 
   return AssertionSuccess();
 }
 
 AssertionResult FakeServerVerifier::VerifyEntityCountByTypeAndName(
     size_t expected_count,
     syncer::ModelType model_type,
     const string& name) const {
   std::unique_ptr<base::DictionaryValue> entities =
       fake_server_->GetEntitiesAsDictionaryValue();
   if (!entities.get()) {
     return DictionaryCreationAssertionFailure();
   }
 
   string model_type_string = ModelTypeToString(model_type);
-  base::ListValue* entity_list = NULL;
+  base::ListValue* entity_list = nullptr;
   size_t actual_count = 0;
   if (entities->GetList(model_type_string, &entity_list)) {
     base::StringValue name_value(name);
     for (const auto& entity : *entity_list) {
       if (name_value.Equals(entity.get()))
         actual_count++;
     }
   }
 
   if (!entity_list) {
@@ skipping 57 matching lines @@
         return AssertionFailure() << "Malformed data: Tab entity not found.";
       }
       tab_urls.insert(tab_ids_to_urls[tab_id]);
     }
     actual_sessions.AddWindow(tab_urls);
   }
   return VerifySessionsHierarchyEquality(expected_sessions, actual_sessions);
 }
 
 }  // namespace fake_server