detect preferences errors

chrome/test/ui/ui_test.cc

Index: chrome/test/ui/ui_test.cc
diff --git a/chrome/test/ui/ui_test.cc b/chrome/test/ui/ui_test.cc
index ff952baac0ba35ad1dc5fa9cf27d012827d01148..9ad2aa175f5f2b09df4ec2beb6351db5eb8360ce 100644
--- a/chrome/test/ui/ui_test.cc
+++ b/chrome/test/ui/ui_test.cc
@@ -706,7 +706,7 @@ static DictionaryValue* LoadDictionaryValueFromPath(const FilePath& path) {
     return NULL;
 
   JSONFileValueSerializer serializer(path);
-  scoped_ptr<Value> root_value(serializer.Deserialize(NULL));
+  scoped_ptr<Value> root_value(serializer.Deserialize(NULL, NULL));
   if (!root_value.get() || root_value->GetType() != Value::TYPE_DICTIONARY)
     return NULL;