Migrate test block 47 and downstream dependencies to Dart 2.0.

tests/language_strong/checked_setter_test.dart

Index: tests/language_strong/checked_setter_test.dart
diff --git a/tests/language_strong/checked_setter_test.dart b/tests/language_strong/checked_setter_test.dart
deleted file mode 100644
index 6d45d8bc358b157174a2a28607eab59647cabd28..0000000000000000000000000000000000000000
--- a/tests/language_strong/checked_setter_test.dart
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright (c) 2013, 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 that implicit setters in checked mode do a type check.
-
-import "package:expect/expect.dart";
-
-class A {
-  C c;
-}
-
-class B extends A {}
-
-class C {}
-
-var array = [new B()];
-
-main() {
-  array[0].c = new C();
-  bool inCheckedMode = false;
-  try {
-    var i = 42;
-    String a = i;
-  } catch (e) {
-    inCheckedMode = true;
-  }
-  if (inCheckedMode) {
-    Expect.throws(() => array[0].c = new B(), (e) => e is TypeError);
-  }
-}