Migrate test block 47 and downstream dependencies to Dart 2.0.

tests/language_2/checked_setter_test.dart

Index: tests/language_2/checked_setter_test.dart
diff --git a/tests/language/checked_setter_test.dart b/tests/language_2/checked_setter_test.dart
similarity index 66%
rename from tests/language/checked_setter_test.dart
rename to tests/language_2/checked_setter_test.dart
index 6d45d8bc358b157174a2a28607eab59647cabd28..46f35cf711eeae1730d3be303b97a4aa759108a1 100644
--- a/tests/language/checked_setter_test.dart
+++ b/tests/language_2/checked_setter_test.dart
@@ -18,14 +18,5 @@ 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);
-  }
+  array[0].c = new B(); /*@compile-error=unspecified*/
 }