Remove most superfluous getter arguments from dart2js.

dart/lib/compiler/implementation/tools/mini_parser.dart

 // Copyright (c) 2012, 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('parser');
 
 #import('dart:io');
 
 #import('../../../utf/utf.dart');
 
@@ skipping 284 matching lines @@
   bool readOnly = false;
   bool buildAst = false;
 }
 
 class MySourceFile extends SourceFile {
   final rawText;
   var stringText;
 
   MySourceFile(filename, this.rawText) : super(filename, null);
 
-  String get text() {
+  String get text {
     if (rawText is String) {
       return rawText;
     } else {
       if (stringText === null) {
         stringText = new String.fromCharCodes(rawText);
         if (stringText.endsWith('\u0000')) {
           // Strip trailing NUL used by ByteArrayScanner to signal EOF.
           stringText = stringText.substring(0, stringText.length - 1);
         }
       }
       return stringText;
     }
   }
 
   set text(String newText) {
     throw "not supported";
   }
 }
 
 class Mock {
   const Mock();
-  bool get useColors() => true;
+  bool get useColors => true;
   internalError(message) { throw message.toString(); }
 }