Language tests updated to use const instead of final.

tests/language/named_parameters_passing_falsy_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.
 
 // Dart test program for testing named parameters with various values that might
 // be implemented as 'falsy' values in a JavaScript implementation.
 
 
 class TestClass {
   TestClass();
 
   method([value = 100]) => value;
 
   static staticMethod([value = 200]) => value;
 }
 
 globalMethod([value = 300]) => value;
 
-final testValues = const [0, 0.0, '', false, null];
+const testValues = const [0, 0.0, '', false, null];
 
 testFunction(f) {
   Expect.isTrue(f() >= 100);
   for (var v in testValues) {
     Expect.equals(v, f(v));
     Expect.equals(v, f(value: v));
   }
 }
 
 main() {
@@ skipping 10 matching lines @@
     Expect.equals(v, TestClass.staticMethod(value: v));
     Expect.equals(v, globalMethod(v));
     Expect.equals(v, globalMethod(value: v));
   }
 
   // Test via indirect call.
   testFunction(obj.method);
   testFunction(TestClass.staticMethod);
   testFunction(globalMethod);
 }