test rename overhaul: step 8 - language tests

tests/language/src/PropertyFieldOverrideTest.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.
-
-// Test overriding a getter property with a field.
-class A {
-  abstract int get v();
-
-  int a() {
-    return v - 1;
-  }
-}
-
-class B extends A {
-  int v = 3;
-
-  int b() {
-    return ++v;
-  }
-}
-
-main() {
-  var x = new B();
-  Expect.equals(3, x.v);
-  Expect.equals(2, x.a());
-  Expect.equals(4, x.b());
-}