VM: Support calling through getters in InstanceMirror.delegate. Implement without accessing private…

runtime/lib/invocation_mirror_patch.dart

Index: runtime/lib/invocation_mirror_patch.dart
diff --git a/runtime/lib/invocation_mirror_patch.dart b/runtime/lib/invocation_mirror_patch.dart
index 4c2e7e501cec5c668556b8c0ededef4819363380..3f76e4e7b2a53abd0e2b3f2dddd1b199ef1e77b4 100644
--- a/runtime/lib/invocation_mirror_patch.dart
+++ b/runtime/lib/invocation_mirror_patch.dart
@@ -133,18 +133,4 @@ class _InvocationMirror implements Invocation {
                                  arguments,
                                  isSuperInvocation);
   }
-
-  static _invoke(Object receiver,
-                 String functionName,
-                 List argumentsDescriptor,
-                 List arguments)
-      native "InvocationMirror_invoke";
-
-  _invokeOn(Object receiver) {
-    return _invoke(receiver, _functionName, _argumentsDescriptor, _arguments);
-  }
-
-  // TODO(ahe): This is a hack.  See _LocalInstanceMirrorImpl.delegate
-  // in mirrors_impl.dart
-  static final _invokeOnClosure = (x, y) => y._invokeOn(x);
 }