Fix and reenable dart2js extra tests and dart2js native tests.

tests/compiler/dart2js_native/native_call_arity2_frog_test.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.
 
 // This is a similar test to NativeCallArity1FrogTest, but makes sure
 // that subclasses also get the right number of arguments.
 
 class A native "*A" {
   int foo([x, y]) native;
 }
@@ skipping 31 matching lines @@
 testDynamicContext() {
   var things = [makeA(), makeB()];
   var a = things[0];
   var b = things[1];
 
   Expect.equals(0, a.foo());
   Expect.equals(1, a.foo(10));
   Expect.equals(2, a.foo(10, 20));
   Expect.throws(() => a.foo(10, 20, 30));
 
-  Expect.equals(1, a.foo(x: 10));   // 1 = x
-  Expect.equals(2, a.foo(y: 20));   // 2 = x, y
+  Expect.equals(1, a.foo(10));
+  Expect.equals(2, a.foo(null, 20));
   Expect.throws(() => a.foo(10, 20, 30));
 
   Expect.equals(0, b.foo());
   Expect.equals(1, b.foo(10));
   Expect.equals(2, b.foo(10, 20));
   Expect.throws(() => b.foo(10, 20, 30));
 
-  Expect.equals(1, b.foo(x: 10));   // 1 = x
-  Expect.equals(2, b.foo(y: 20));   // 2 = x, y
+  Expect.equals(1, b.foo(10));
+  Expect.equals(2, b.foo(null, 20));
   Expect.throws(() => b.foo(10, 20, 30));
 }
 
 testStaticContext() {
   A a = makeA();
   B b = makeB();
 
   Expect.equals(0, a.foo());
   Expect.equals(1, a.foo(10));
   Expect.equals(2, a.foo(10, 20));
   Expect.throws(() => a.foo(10, 20, 30));
 
-  Expect.equals(1, a.foo(x: 10));   // 1 = x
-  Expect.equals(2, a.foo(y: 20));   // 2 = x, y
+  Expect.equals(1, a.foo(10));
+  Expect.equals(2, a.foo(null, 20));
   Expect.throws(() => a.foo(10, 20, 30));
 
   Expect.equals(0, b.foo());
   Expect.equals(1, b.foo(10));
   Expect.equals(2, b.foo(10, 20));
   Expect.throws(() => b.foo(10, 20, 30));
 
-  Expect.equals(1, b.foo(x: 10));   // 1 = x
-  Expect.equals(2, b.foo(y: 20));   // 2 = x, y
+  Expect.equals(1, b.foo(10));
+  Expect.equals(2, b.foo(null, 20));
   Expect.throws(() => b.foo(10, 20, 30));
 }
 
 main() {
   setup();
   testDynamicContext();
   testStaticContext();
 }