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

compiler/java/com/google/dart/compiler/parser/DartScanner.java

Index: compiler/java/com/google/dart/compiler/parser/DartScanner.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartScanner.java b/compiler/java/com/google/dart/compiler/parser/DartScanner.java
index 38024deabc4ab7c02a9422c2edc2330bd6c94d07..bb1e82b419795dc1f3c6b7bc6c149651f2099b92 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartScanner.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartScanner.java
@@ -1,4 +1,4 @@
-// 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.
 
@@ -1135,17 +1135,15 @@ public class DartScanner {
         return Token.LT;
 
       case '>':
-        // > >= >> >>= >>> >>>=
+        // > >= >> >>=
         advance();
         if (is('='))
           return select(Token.GTE);
         if (is('>')) {
-          // >> >>= >>> >>>=
+          // >> >>=
           advance();
           if (is('='))
             return select(Token.ASSIGN_SAR);
-          if (is('>'))
-            return select('=', Token.ASSIGN_SHR, Token.SHR);
           return Token.SAR;
         }
         return Token.GT;