Fix for Issue 8460.

tests/compiler/dart2js_native/native_constructor_name_test.dart

+// Copyright (c) 2013, 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.
+
+// Test to see if a Dart class name is confused with dispatch tag.  Both class A
+// and class Z have a JavaScript constuctor named "A".  The dynamic native class
+// dispatch hook on Object.prototype should avoid patching the Dart class A.
+// This could be done by renaming the Dart constructor or by being able to check
+// that objects are Dart classes.
+
+class A {
+}
+
+class Z native "*A" {
+  foo() => 100;
+}
+
+makeZ() native;
+
+void setup() native """
+function A(){}
+makeZ = function(){return new A};
+""";
+
+main() {
+  setup();
+
+  var a = new A();
+  var z = makeZ();
+
+  Expect.equals(100, z.foo());
+
+  Expect.throws(() => a.foo(),  (ex) => ex is NoSuchMethodError);
+}