base: Use std::move() instead of Pass() for real movable types.

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 ebfc4948ecf3b9f0c6b8089ea92eb463a5523000..f974c147916d853c39e0e8b7c48e0b24dc944227 100644
--- a/base/test/values_test_util.cc
+++ b/base/test/values_test_util.cc
@@ -70,7 +70,7 @@ scoped_ptr<Value> ParseJson(base::StringPiece json) {
     ADD_FAILURE() << "Failed to parse \"" << json << "\": " << error_msg;
     result = Value::CreateNullValue();
   }
-  return result.Pass();
+  return result;
 }
 
 }  // namespace test