added a const keyword for a methods that return constant literal...

platform/javascript/os_javascript.cpp

@@ -1159,7 +1159,7 @@ Error OS_JavaScript::shell_open(String p_uri) {
 	return OK;
 }
 
-String OS_JavaScript::get_name() {
+String OS_JavaScript::get_name() const {
 
 	return "HTML5";
 }