Revert "Native mixin interceptor bug fix"

tests/compiler/dart2js_native/native_mixin_multiple3_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.
-
-import "package:expect/expect.dart";
-
-// Test that native classes and plain classes can access methods defined only by
-// the same mixin.
-
-
-class D extends Object with M1, M2, M3 {
-}
-
-class E extends D {
-  foo() => 'E.foo';
-}
-
-class M1 { }
-
-class M2 {
-  foo() => 'M2.foo';
-}
-
-class M3 { }
-
-class A native "A" {
-  foo() => 'A.foo';
-}
-
-class B extends A with M1, M2, M3 native "B" {}
-
-class C extends B native "C" {
-  foo() => 'C.foo';
-}
-
-makeA() native;
-makeB() native;
-makeC() native;
-
-void setup() native """
-function A() {}
-function B() {}
-function C() {}
-makeA = function(){return new A;};
-makeB = function(){return new B;};
-makeC = function(){return new C;};
-""";
-
-var g;
-
-callFoo(x) {
-  // Dominating getInterceptor call should be shared.
-  g = x.toString();
-  // These call sites are partitioned into pure-dart and native subsets,
-  // allowing differences in getInterceptors.
-  if (x is D) return x.foo();
-  if (x is A) return x.foo();
-}
-
-makeAll() => [makeA(), makeB(), makeC(), new D(), new E()];
-
-main() {
-  setup();
-  /*
-  var a = makeA();
-  var b = makeB();
-  var c = makeC();
-  var d = new D();
-  var e = new E();
-  */
-  var x = makeAll();
-  var a = x[0];
-  var b = x[1];
-  var c = x[2];
-  var d = x[3];
-  var e = x[4];
-
-  var f = callFoo;
-
-  Expect.equals('A.foo', f(a));
-  Expect.equals('M2.foo', f(b));
-  Expect.equals('C.foo', f(c));
-  Expect.equals('M2.foo', f(d));
-  Expect.equals('E.foo', f(e));
-}