Remove support for >>> and >>>= operators in dartc

compiler/javatests/com/google/dart/compiler/parser/Shifting.dart

Index: compiler/javatests/com/google/dart/compiler/parser/Shifting.dart
diff --git a/compiler/javatests/com/google/dart/compiler/parser/Shifting.dart b/compiler/javatests/com/google/dart/compiler/parser/Shifting.dart
index 5400639eb4a360a78e54e2ebb55cd95bd672a274..c345c6606be3ed35ff880e96a0bffe713844e5c5 100644
--- a/compiler/javatests/com/google/dart/compiler/parser/Shifting.dart
+++ b/compiler/javatests/com/google/dart/compiler/parser/Shifting.dart
@@ -1,13 +1,8 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 class Shifting {
-  operator >>>(other) {
-    Box<Box<Box<prefix.Fisk>>> foo = null;
-    return other >>> 1;
-  }
-
   operator >>(other) {
     Box<Box<prefix.Fisk>> foo = null;
     return other >> 1;