Remove base::Value::CreateNullValue

base/test/values_test_util.cc

Index: base/test/values_test_util.cc
diff --git a/base/test/values_test_util.cc b/base/test/values_test_util.cc
index ab12cfbfd9846294d108ddbb26916b6dc4098291..0cd8ea29f6680d040328d5e40e8ea8e0c0682a00 100644
--- a/base/test/values_test_util.cc
+++ b/base/test/values_test_util.cc
@@ -7,6 +7,7 @@
 #include <memory>
 
 #include "base/json/json_reader.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -68,7 +69,7 @@ std::unique_ptr<Value> ParseJson(base::StringPiece json) {
       json, base::JSON_ALLOW_TRAILING_COMMAS, NULL, &error_msg);
   if (!result) {
     ADD_FAILURE() << "Failed to parse \"" << json << "\": " << error_msg;
-    result = Value::CreateNullValue();
+    result = MakeUnique<Value>();
   }
   return result;
 }