Revert "Updated parser to produce error when trying to reinitialize final variables in class constr…

tests/language/const_error_multiply_initialized_test.dart

 // Copyright (c) 2015, 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.
 
 import "package:expect/expect.dart";
 
 class C {
   // Since this field is final and already initialized, the specification says
   // that a runtime error occurs when attempting to initialize it in the
   // constructor. When used as a compile-time constant, this causes a
   // compile-time error.
   final x = 1;
 
   const C(
       this. //# 01: compile-time error
-      this. //# 02: compile-time error 
+      this. //# 02: static type warning
       x
     )
     : x = 2 //# 03: compile-time error
-    : x = 2 //# 04: compile-time error
+    : x = 2 //# 04: static type warning
     ;
 }
 
 instantiateC() {
   const C(0); //# 01: continued
   const C(0); //# 03: continued
   new C(0);
 }
 
 main() {
   bool shouldThrow = false;
   shouldThrow = true; //# 02: continued
   shouldThrow = true; //# 04: continued
   if (shouldThrow) {
     Expect.throws(instantiateC);
   } else {
     instantiateC();
   }
 }