Remove most superfluous getter arguments from dart2js.

dart/lib/compiler/implementation/source_file.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('source_file');
 
 #import('colors.dart', prefix: 'colors');
 
 /**
  * Represents a file of source code.
  */
 class SourceFile {
 
   /** The name of the file. */
   final String filename;
 
   /** The text content of the file. */
   final String text;
 
   List<int> _lineStarts;
 
   SourceFile(this.filename, this.text);
 
-  List<int> get lineStarts() {
+  List<int> get lineStarts {
     if (_lineStarts == null) {
       var starts = [0];
       var index = 0;
       while (index < text.length) {
         index = text.indexOf('\n', index) + 1;
         if (index <= 0) break;
         starts.add(index);
       }
       starts.add(text.length + 1);
       _lineStarts = starts;
@@ skipping 47 matching lines @@
       }
 
       for (; i < toColumn; i++) {
         buf.add(color('^'));
       }
     }
 
     return buf.toString();
   }
 }