fix #30030, fix #27327 - fix tearoffs and various Object member bugs

pkg/dev_compiler/tool/input_sdk/private/interceptors.dart

 // Copyright (c) 2012, 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 dart._interceptors;
 
 import 'dart:collection';
 import 'dart:_internal' hide Symbol;
 import 'dart:_js_helper';
 import 'dart:_foreign_helper' show JS;
 import 'dart:math' show Random;
+import 'dart:_runtime' show getGenericClass, wrapType;
 
 part 'js_array.dart';
 part 'js_number.dart';
 part 'js_string.dart';
 
 // TODO(jmesserly): remove, this doesn't do anything for us.
 abstract class Interceptor {
   const Interceptor();
 
   // Use native JS toString method instead of standard Dart Object.toString.
@@ skipping 73 matching lines @@
 
 // Obsolete in dart dev compiler. Added only so that the same version of
 // dart:html can be used in dart2js an dev compiler.
 // Warning: calls to these methods need to be removed before custom elements
 // and cross-frame dom objects behave correctly in ddc.
 // See https://github.com/dart-lang/sdk/issues/28326
 findInterceptorConstructorForType(Type type) {}
 findConstructorForNativeSubclassType(Type type, String name) {}
 getNativeInterceptor(object) {}
 setDispatchProperty(object, value) {}