Hoist InstanceMirror.delegate to ObjectMirror.

sdk/lib/_internal/js_runtime/lib/js_mirrors.dart

Index: sdk/lib/_internal/js_runtime/lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/js_mirrors.dart b/sdk/lib/_internal/js_runtime/lib/js_mirrors.dart
index e5c849586aa7c5ff3fb4f6cf11bf4f09d2dfb9bd..aa836ca0baa45592736d39b2e0e4c2cee6b2a180 100644
--- a/sdk/lib/_internal/js_runtime/lib/js_mirrors.dart
+++ b/sdk/lib/_internal/js_runtime/lib/js_mirrors.dart
@@ -443,6 +443,10 @@ class JsLibraryMirror extends JsDeclarationMirror with JsObjectMirror
         .invoke(#call, positionalArguments, namedArguments);
   }
 
+  delegate(Invocation invocation) {
+    throw new UnimplementedError();
+  }
+
   _loadField(String name) {
     // TODO(ahe): What about lazily initialized fields? See
     // [JsClassMirror.getField].
@@ -853,6 +857,10 @@ class JsMixinApplication extends JsTypeMirror with JsObjectMirror
         null, setterSymbol(fieldName), [arg], null);
   }
 
+  delegate(Invocation invocation) {
+    throw new UnimplementedError();
+  }
+
   List<ClassMirror> get superinterfaces => [mixin];
 
   Map<Symbol, MethodMirror> get __constructors => _mixin.__constructors;
@@ -1512,6 +1520,10 @@ class JsTypeBoundClassMirror extends JsDeclarationMirror
     return _class.invoke(memberName, positionalArguments, namedArguments);
   }
 
+  delegate(Invocation invocation) {
+    throw new UnimplementedError();
+  }
+
   bool get isOriginalDeclaration => false;
 
   ClassMirror get originalDeclaration => _class;
@@ -2028,6 +2040,10 @@ class JsClassMirror extends JsTypeMirror with JsObjectMirror
     return reflect(mirror._invoke(positionalArguments, namedArguments));
   }
 
+  delegate(Invocation invocation) {
+    throw new UnimplementedError();
+  }
+
   bool get isOriginalDeclaration => true;
 
   ClassMirror get originalDeclaration => this;
@@ -2609,6 +2625,7 @@ class BrokenClassMirror {
   InstanceMirror getField(Symbol fieldName) => throw new UnimplementedError();
   InstanceMirror setField(Symbol fieldName, Object value)
       => throw new UnimplementedError();
+  delegate(Invocation invocation) => throw new UnimplementedError();
   List<TypeVariableMirror> get typeVariables => throw new UnimplementedError();
   List<TypeMirror> get typeArguments => throw new UnimplementedError();
   TypeMirror get originalDeclaration => throw new UnimplementedError();