Language tests updated to use const instead of final.

tests/language/ct_const_test.dart

 // Copyright (c) 2011, 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.
 // All things regarding compile time constant expressions.
 
 interface Roman {
-  static final I = 1;
-  static final II = 2;
-  static final III = 3;
-  static final IV = 4;
-  static final V = 5;
+  static const I = 1;
+  static const II = 2;
+  static const III = 3;
+  static const IV = 4;
+  static const V = 5;
 
-  static final VivaItalia = const {"green": 1, "red": 3, "white": 2};
+  static const VivaItalia = const {"green": 1, "red": 3, "white": 2};
 }
 
 
 class Point {
-  static final int zero = 0;
+  static const int zero = 0;
 
-  static final origin = const Point(0, 0);
-  static final origin2 = const Point(zero, Roman.IV - 4);
+  static const origin = const Point(0, 0);
+  static const origin2 = const Point(zero, Roman.IV - 4);
 
   const Point(x, y) : x_= x, y_ = y;
   const Point.X(x) : x_ = x, y_ = Roman.V - Roman.II - 3;
 
   bool operator ==(final Point other) {
     return (this.x_ == other.x_) && (this.y_ == other.y_);
   }
 
   final int x_, y_;
 }
 
 
 class Line {
   const Line(Point begin, Point end) : beg_ = begin, end_ = end;
   final Point beg_;
   final Point end_;
 }
 
 
 class CTConstTest {
   static int getZero() { return 0; }
-  static final naught = null;
+  static const naught = null;
 
   static testMain() {
     Expect.equals(0, Point.zero);
     Expect.equals(0, Point.origin.x_);
     Expect.equals(true, Point.origin === Point.origin2);
     var p1 = const Point(0, 0);
     Expect.equals(true, Point.origin === p1);
 
     Expect.equals(false, Point.origin == const Point(1, 1));
     Expect.equals(false, Point.origin === const Point(1, 1));
@@ skipping 60 matching lines @@
     Expect.equals(true, caughtException);
     Expect.equals(1, c11dItaly["green"]);
 
     Expect.equals(true, null === naught);
   }
 }
 
 main() {
   CTConstTest.testMain();
 }