Migrate block 162 to Dart 2.0.

tests/language_strong/type_variable_bounds_test.dart

-// Copyright (c) 2012, 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 of parameterized factory methods.
-
-class Foo<T extends num> {
-  Foo();
-
-  factory Foo.bad() = XFoo; // //# 00: static type warning
-
-  factory Foo.good() = Foo;
-
-  factory Foo.IFoo() {
-    return null;
-  }
-}
-
-abstract class IFoo<T extends num> {
-  factory IFoo() = Foo<T>;
-}
-
-// String is not assignable to num.
-class Baz
-    extends Foo<String> //# 01: static type warning, dynamic type error
-{}
-
-class Biz extends Foo<int> {}
-
-Foo<int> fi;
-
-// String is not assignable to num.
-Foo
-    <String> //# 02: static type warning, dynamic type error
-    fs;
-
-class Box<T> {
-  // Box.T is not assignable to num.
-  Foo<T> t; //# 03: static type warning
-
-  makeFoo() {
-    // Box.T is not assignable to num.
-    return new Foo<T>(); //# 04: static type warning, dynamic type error
-  }
-}
-
-main() {
-  // String is not assignable to num.
-  var v1 = new Foo<String>(); //# 05: static type warning, dynamic type error
-
-  // String is not assignable to num.
-  Foo<String> v2 = null; //# 06: static type warning
-
-  new Baz();
-  new Biz();
-
-  fi = new Foo();
-  fs = new Foo();
-
-  new Box().makeFoo();
-  new Box<int>().makeFoo();
-  new Box<String>().makeFoo();
-
-  // Fisk does not exist.
-  new Box<Fisk>(); //# 07: static type warning
-
-  // Too many type arguments.
-  new Box<Object, Object>(); //# 08: static type warning
-
-  // Fisk does not exist.
-  Box<Fisk> box = null; //# 09: static type warning
-
-  // Too many type arguments.
-  Box<Object, Object> box = null; //# 10: static type warning
-}