Revert "Enable syntax-only support for generic functions by default."

tests/language/generic_methods_generic_function_parameter_test.dart

Index: tests/language/generic_methods_generic_function_parameter_test.dart
diff --git a/tests/language/generic_methods_generic_function_parameter_test.dart b/tests/language/generic_methods_generic_function_parameter_test.dart
index 45014c4edbfbafb79fcb359378b8f25ac07a7142..81eeade55f528f915cca397c9b3f3944335a1a7c 100644
--- a/tests/language/generic_methods_generic_function_parameter_test.dart
+++ b/tests/language/generic_methods_generic_function_parameter_test.dart
@@ -2,6 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
+// DartOptions=--generic-method-syntax
 // VMOptions=--generic-method-syntax
 
 import "package:expect/expect.dart";