Remove the ability in dart2js to turn off syntax-only generic methods.

pkg/compiler/lib/src/parser/class_element_parser.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 library dart2js.parser.classes;
 
-import '../options.dart' show ParserOptions;
 import '../tokens/token.dart' show Token;
 import 'listener.dart' show Listener;
 import 'partial_parser.dart' show PartialParser;
 
 class ClassElementParser extends PartialParser {
-  ClassElementParser(Listener listener, ParserOptions options)
-      : super(listener, options);
+  ClassElementParser(Listener listener): super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }