Remove support for remaining deprecated features.

tests/language/unsupported_operators_test.dart

+// 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 handling of unsupported operators.
+
+library unsupported_operators;
+
+class C {
+  m() {
+    print(super === null); /// 01: compile-time error

[ahe, 2013/08/06 14:48:40]

print(
super === /// 01: compile-time error
null)

[Johnni Winther, 2013/08/07 06:56:25]

Done.

+    print(super !== null); /// 02: compile-time error

[ahe, 2013/08/06 14:48:40]

Ditto.

[Johnni Winther, 2013/08/07 06:56:25]

Done.

+  }
+}
+
+void main() {
+  new C().m(); /// 01: continued

[ahe, 2013/08/06 14:48:40]

No need to use continue here.

[Johnni Winther, 2013/08/07 06:56:25]

Done.

+  new C().m(); /// 02: continued
+  print("foo" === null); /// 03: compile-time error

[ahe, 2013/08/06 14:48:40]

print("foo"
=== null /// 03: compile-time error
);

[Johnni Winther, 2013/08/07 06:56:25]

Done.

+  print("foo" !== null); /// 04: compile-time error

[ahe, 2013/08/06 14:48:40]

Ditto.

[Johnni Winther, 2013/08/07 06:56:25]

Done.

+}