Revert "Native mixin interceptor bug fix"

sdk/lib/_internal/compiler/implementation/js_backend/backend.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_backend;
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
@@ skipping 827 matching lines @@
    */
   Set<ClassElement> getInterceptedClassesOn(SourceString name) {
     Set<Element> intercepted = interceptedElements[name];
     if (intercepted == null) return null;
     return interceptedClassesCache.putIfAbsent(name, () {
       // Populate the cache by running through all the elements and
       // determine if the given selector applies to them.
       Set<ClassElement> result = new Set<ClassElement>();
       for (Element element in intercepted) {
         ClassElement classElement = element.getEnclosingClass();
-        if (classElement.isNative()
-            || interceptedClasses.contains(classElement)) {
-          result.add(classElement);
-        }
-        if (classesMixedIntoNativeClasses.contains(classElement)) {
-          Set<Element> nativeSubclasses = nativeSubclassesOfMixin(classElement);
-          if (nativeSubclasses != null) result.addAll(nativeSubclasses);
-        }
+        result.add(classElement);
       }
       return result;
     });
   }
 
-  Set<Element> nativeSubclassesOfMixin(ClassElement mixin) {
-    Set<MixinApplicationElement> uses = compiler.world.mixinUses[mixin];
-    if (uses == null) return null;
-    Set<Element> result = null;
-    for (MixinApplicationElement use in uses) {
-      Iterable<ClassElement> subclasses = compiler.world.subclasses[use];
-      if (subclasses != null) {
-        for (ClassElement subclass in subclasses) {
-          if (subclass.isNative()) {
-            if (result == null) result = new Set<Element>();
-            result.add(subclass);
-          }
-        }
-      }
-    }
-    return result;
-  }
-
   bool operatorEqHandlesNullArgument(FunctionElement operatorEqfunction) {
     return specialOperatorEqClasses.contains(
         operatorEqfunction.getEnclosingClass());
   }
 
   void initializeHelperClasses() {
     getInterceptorMethod =
         compiler.findInterceptor(const SourceString('getInterceptor'));
     interceptedNames =
         compiler.findInterceptor(const SourceString('interceptedNames'));
@@ skipping 922 matching lines @@
   ClassElement get constListImplementation => jsArrayClass;
   ClassElement get fixedListImplementation => jsFixedArrayClass;
   ClassElement get growableListImplementation => jsExtendableArrayClass;
   ClassElement get mapImplementation => mapLiteralClass;
   ClassElement get constMapImplementation => constMapLiteralClass;
   ClassElement get functionImplementation => jsFunctionClass;
   ClassElement get typeImplementation => typeLiteralClass;
   ClassElement get boolImplementation => jsBoolClass;
   ClassElement get nullImplementation => jsNullClass;
 }