dart2js: Share nativeSuperclassTagName between runtime and compiler.

sdk/lib/_internal/compiler/js_lib/native_helper.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.
 
 part of _js_helper;
 
 
 // TODO(ngeoffray): stop using this method once our optimizers can
 // change str1.contains(str2) into str1.indexOf(str2) != -1.
 bool contains(String userAgent, String name) {
@@ skipping 93 matching lines @@
 
 /**
  * A JavaScript object mapping tags to `true` or `false`.
  *
  * Example: 'HTMLImageElement' maps to `true` since, as there are no subclasses
  * of ImageElement, it is a leaf class in the native class hierarchy.
  */
 get leafTags => JS_EMBEDDED_GLOBAL('=Object', LEAF_TAGS);
 
 String findDispatchTagForInterceptorClass(interceptorClassConstructor) {
-  return JS('', r'#.$nativeSuperclassTag', interceptorClassConstructor);
+  return JS('', r'#.#',
+            interceptorClassConstructor, NATIVE_SUPERCLASS_TAG_NAME);
 }
 
 /**
  * Cache of dispatch records for instances.  This is a JavaScript object used as
  * a map.  Keys are instance tags, e.g. "!SomeThing".  The cache permits the
  * sharing of one dispatch record between multiple instances.
  */
 var dispatchRecordsForInstanceTags;
 
 /**
@@ skipping 517 matching lines @@
 const _safariHooksTransformer = const JS_CONST(r'''
 function(hooks) { return hooks; }
 ''');
 
 
 const _dartExperimentalFixupGetTagHooksTransformer = const JS_CONST(r'''
 function(hooks) {
   if (typeof dartExperimentalFixupGetTag != "function") return hooks;
   hooks.getTag = dartExperimentalFixupGetTag(hooks.getTag);
 }''');