Hoist InstanceMirror.delegate to ObjectMirror.

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
diff --git a/runtime/lib/mirrors_impl.dart b/runtime/lib/mirrors_impl.dart
index c64be5de39f23c626b4a5bbd806b34335d96d1ad..0c7b0bba81290769b4fa72c0bc7599125024a47b 100644
--- a/runtime/lib/mirrors_impl.dart
+++ b/runtime/lib/mirrors_impl.dart
@@ -371,6 +371,25 @@ abstract class _LocalObjectMirror extends _LocalMirror implements ObjectMirror {
     this._invokeSetter(_reflectee, _n(memberName), value);
     return reflect(value);
   }
+
+  delegate(Invocation invocation) {
+    if (invocation.isMethod) {
+      return this.invoke(invocation.memberName,
+                         invocation.positionalArguments,
+                         invocation.namedArguments).reflectee;
+    }
+    if (invocation.isGetter) {
+      return this.getField(invocation.memberName).reflectee;
+    }
+    if (invocation.isSetter) {
+      var unwrapped = _n(invocation.memberName);
+      var withoutEqual = _s(unwrapped.substring(0, unwrapped.length - 1));
+      var arg = invocation.positionalArguments[0];
+      this.setField(withoutEqual, arg).reflectee;
+      return arg;
+    }
+    throw "UNREACHABLE";
+  }
 }
 
 class _LocalInstanceMirror extends _LocalObjectMirror
@@ -393,25 +412,6 @@ class _LocalInstanceMirror extends _LocalObjectMirror
 
   get reflectee => _reflectee;
 
-  delegate(Invocation invocation) {
-    if (invocation.isMethod) {
-      return this.invoke(invocation.memberName,
-                         invocation.positionalArguments,
-                         invocation.namedArguments).reflectee;
-    }
-    if (invocation.isGetter) {
-      return this.getField(invocation.memberName).reflectee;
-    }
-    if (invocation.isSetter) {
-      var unwrapped = _n(invocation.memberName);
-      var withoutEqual = _s(unwrapped.substring(0, unwrapped.length - 1));
-      var arg = invocation.positionalArguments[0];
-      this.setField(withoutEqual, arg).reflectee;
-      return arg;
-    }
-    throw "UNREACHABLE";
-  }
-
   String toString() => 'InstanceMirror on ${Error.safeToString(_reflectee)}';
 
   bool operator ==(other) {