base: Add three helper functions to Values API.

chrome/browser/sync/engine/syncapi.cc

 // Copyright (c) 2011 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 "chrome/browser/sync/engine/syncapi.h"
 
 #include <algorithm>
 #include <bitset>
 #include <iomanip>
 #include <list>
@@ skipping 1162 matching lines @@
     }
     node_value = node_dict;
   } else {
     ReadNode node(trans);
     if (node.InitByIdLookup(id)) {
       node_value = node.GetDetailsAsValue();
     }
   }
   if (!node_value) {
     NOTREACHED();
-    node_value = Value::CreateNullValue();
+    node_value = base::NullValue();
   }
   value->Set("node", node_value);
   return value;
 }
 
 SyncManager::ExtraPasswordChangeRecordData::ExtraPasswordChangeRecordData() {}
 
 SyncManager::ExtraPasswordChangeRecordData::ExtraPasswordChangeRecordData(
     const sync_pb::PasswordSpecificsData& data)
     : unencrypted_(data) {
@@ skipping 1880 matching lines @@
 void SyncManager::TriggerOnIncomingNotificationForTest(
     const syncable::ModelTypeBitSet& model_types) {
   syncable::ModelTypePayloadMap model_types_with_payloads =
       syncable::ModelTypePayloadMapFromBitSet(model_types,
           std::string());
 
   data_->OnIncomingNotification(model_types_with_payloads);
 }
 
 }  // namespace sync_api