Hoist InstanceMirror.delegate to ObjectMirror.

tests/lib/mirrors/delegate_library_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, 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.
 
-library test.invoke_named_test;
+library test.delegate_library;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
-class C {
-  method(a, b, c) => "$a-$b-$c";
-  methodWithNamed(a, {b:'B', c}) => "$a-$b-$c";
-  methodWithOpt(a, [b, c='C']) => "$a-$b-$c";
-  get getter => 'g';
-  set setter(x) {
-    field = x*2;
-    return 'unobservable value';
-  }
-  var field;
+method(a, b, c) => "$a-$b-$c";
+methodWithNamed(a, {b:'B', c}) => "$a-$b-$c";
+methodWithOpt(a, [b, c='C']) => "$a-$b-$c";
+get getter => 'g';
+set setter(x) {
+  field = x*2;
+  return 'unobservable value';
 }
+var field;
+
 
 class Proxy {
   var targetMirror;
-  Proxy(target) : this.targetMirror = reflect(target);
+  Proxy(this.targetMirror);
   noSuchMethod(invocation) => targetMirror.delegate(invocation);
 }
 
 main() {
-  var c = new C();
-  var proxy = new Proxy(c);
+  var proxy = new Proxy(reflectClass(Proxy).owner);
   var result;
 
   Expect.equals('X-Y-Z', proxy.method('X', 'Y', 'Z'));
 
   Expect.equals('X-B-null', proxy.methodWithNamed('X'));
   Expect.equals('X-Y-null', proxy.methodWithNamed('X', b: 'Y'));
   Expect.equals('X-Y-Z', proxy.methodWithNamed('X', b: 'Y', c: 'Z'));
 
   Expect.equals('X-null-C', proxy.methodWithOpt('X'));
   Expect.equals('X-Y-C', proxy.methodWithOpt('X', 'Y'));
   Expect.equals('X-Y-Z', proxy.methodWithOpt('X', 'Y', 'Z'));
 
   Expect.equals('g', proxy.getter);
 
   Expect.equals(5, proxy.setter = 5);
   Expect.equals(10, proxy.field);
 
   Expect.equals(5, proxy.field = 5);
   Expect.equals(5, proxy.field);
 }