Use elements/types.dart in codegen.dart

pkg/compiler/lib/src/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.
 
 library js_backend.backend;
 
 import 'dart:async' show Future;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 
@@ skipping 1081 matching lines @@
         registerBackendUse(helpers.createRuntimeType);
       }
       impactBuilder.registerTypeUse(
           new TypeUse.instantiation(backendClasses.typeImplementation.rawType));
     }
     lookupMapAnalysis.registerConstantKey(constant);
   }
 
   void computeImpactForInstantiatedConstantType(
       DartType type, WorldImpactBuilder impactBuilder) {
-    DartType instantiatedType =
-        type.isFunctionType ? commonElements.functionType : type;
     if (type is InterfaceType) {
       impactBuilder
-          .registerTypeUse(new TypeUse.instantiation(instantiatedType));
+          .registerTypeUse(new TypeUse.instantiation(type));
       if (classNeedsRtiField(type.element)) {
         impactBuilder.registerStaticUse(new StaticUse.staticInvoke(
             // TODO(johnniwinther): Find the right [CallStructure].
             helpers.setRuntimeTypeInfo,
             null));
       }
       if (type.element == backendClasses.typeImplementation) {
         // If we use a type literal in a constant, the compile time
         // constant emitter will generate a call to the createRuntimeType
         // helper so we register a use of that.
@@ skipping 2156 matching lines @@
   @override
   bool isNativeClass(ClassElement element) {
     return helpers.backend.isNative(element);
   }
 
   @override
   bool isNativeMember(MemberElement element) {
     return helpers.backend.isNative(element);
   }
 }