Implement revised factories in the VM.

tests/language/src/TypeVariableBoundsTest.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.
 // VMOptions=--enable_type_checks
 
 // Test of parameterized factory methods.
 
 class Foo<T extends num> {
   Foo();
 
-  // F is not assignable to num.
-  factory IFoo<F extends String>.bad() { return null; } /// 00: static type error
+  factory XFoo.bad() { return null; } /// 00: compile-time error
 
-  factory IFoo<F extends num>.good() { return null; }
+  factory IFoo.good() { return null; }
 
-  // The bound of F is Object which is assignable to num.
-  factory IFoo<F>.ish() { return null; }
+  factory IFoo() { return null; }
 }
 
-interface IFoo<X extends num> factory Foo<T extends num> {
+interface IFoo<T extends num> factory Foo<T extends num> {
 }
 
 // String is not assignable to num.
 class Baz extends Foo<String> {} /// 01: compile-time error
 
 class Biz extends Foo<int> {}
 
 Foo<int> fi;
 
 // String is not assignable to num.
@@ skipping 16 matching lines @@
     var v1 = new Foo<String>(); /// 05: compile-time error
 
     // String is not assignable to num.
     Foo<String> v2 = null; /// 06: compile-time error
   }
 }
 
 main() {
   TypeVariableBoundsTest.testMain();
 }