diff --git a/pkg/compiler/lib/src/common/backend_api.dart b/pkg/compiler/lib/src/common/backend_api.dart
index a33f1fdffbf..73e22cd4400 100644
--- a/pkg/compiler/lib/src/common/backend_api.dart
+++ b/pkg/compiler/lib/src/common/backend_api.dart
@@ -262,6 +262,10 @@ abstract class Backend extends Target {
   /// Returns true if this element needs reflection information at runtime.
   bool isAccessibleByReflection(Element element) => true;
 
+  /// Returns true if this member element needs reflection information at
+  /// runtime.
+  bool isMemberAccessibleByReflection(MemberElement element) => true;
+
   /// Returns true if this element is covered by a mirrorsUsed annotation.
   ///
   /// Note that it might still be ok to tree shake the element away if no
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index 40956cf3eed..681a6e06095 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -1991,6 +1991,10 @@ class JavaScriptBackend extends Backend {
     return membersNeededForReflection.contains(element);
   }
 
+  bool isMemberAccessibleByReflection(MemberElement element) {
+    return membersNeededForReflection.contains(element);
+  }
+
   /**
    * Returns true if the element has to be resolved due to a mirrorsUsed
    * annotation. If we have insufficient mirrors used annotations, we only
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/class_builder.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/class_builder.dart
index a452dd5b729..f0167e1aea3 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/class_builder.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/class_builder.dart
@@ -4,15 +4,11 @@
 
 library dart2js.js_emitter.full_emitter.class_builder;
 
-import '../../elements/elements.dart'
-    show
-    ClassElement,
-    Element;
+import '../../elements/elements.dart' show Entity;
+import '../../elements/entities.dart';
 import '../../js/js.dart' as jsAst;
 import '../../js/js.dart' show js;
-import '../../js_backend/js_backend.dart'
-    show
-    Namer;
+import '../../js_backend/js_backend.dart' show Namer;
 
 /**
  * A data structure for collecting fragments of a class definition.
@@ -25,13 +21,13 @@ class ClassBuilder {
   jsAst.Node functionType;
   List<jsAst.Node> fieldMetadata;
 
-  final Element element;
+  final Entity element;
   final Namer namer;
   final bool isForActualClass;
 
   ClassBuilder(this.element, this.namer, this.isForActualClass);
 
-  ClassBuilder.forClass(ClassElement cls, this.namer)
+  ClassBuilder.forClass(ClassEntity cls, this.namer)
       : isForActualClass = true,
         element = cls;
 
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
index 3dfdbab20d7..c5d5181a020 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/class_emitter.dart
@@ -9,18 +9,10 @@ import '../../common/names.dart' show Names;
 import '../../elements/resolution_types.dart' show ResolutionDartType;
 import '../../deferred_load.dart' show OutputUnit;
 import '../../elements/elements.dart'
-    show
-    ClassElement,
-    Element,
-    FieldElement,
-    MemberElement,
-    Name;
+    show ClassElement, Element, FieldElement, MemberElement, Name;
 import '../../js/js.dart' as jsAst;
 import '../../js/js.dart' show js;
-import '../../js_backend/js_backend.dart'
-    show
-    CompoundName,
-    Namer;
+import '../../js_backend/js_backend.dart' show CompoundName, Namer;
 import '../../universe/selector.dart' show Selector;
 import '../../util/util.dart' show equalElements;
 import '../../world.dart' show ClosedWorld;
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/container_builder.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/container_builder.dart
index a30e725f4c8..8d344ae8e4b 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/container_builder.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/container_builder.dart
@@ -7,11 +7,11 @@ library dart2js.js_emitter.full_emitter.container_builder;
 import '../../constants/values.dart';
 import '../../elements/elements.dart'
     show
-    Element,
-    Elements,
-    FunctionSignature,
-    MetadataAnnotation,
-    MethodElement;
+        Element,
+        Elements,
+        FunctionSignature,
+        MetadataAnnotation,
+        MethodElement;
 import '../../js/js.dart' as jsAst;
 import '../../js/js.dart' show js;
 import '../js_emitter.dart' hide Emitter, EmitterFactory;
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/interceptor_emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/interceptor_emitter.dart
index 1ef8573a122..516641db9cf 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/interceptor_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/interceptor_emitter.dart
@@ -5,10 +5,7 @@
 library dart2js.js_emitter.full_emitter.interceptor_emitter;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
-import '../../elements/elements.dart'
-    show
-    ClassElement,
-    MethodElement;
+import '../../elements/entities.dart';
 import '../../js/js.dart' as jsAst;
 import '../../js/js.dart' show js;
 import '../../world.dart' show ClosedWorld;
@@ -22,14 +19,14 @@ class InterceptorEmitter extends CodeEmitterHelper {
 
   InterceptorEmitter(this.closedWorld);
 
-  void recordMangledNameOfMemberMethod(MethodElement member, jsAst.Name name) {
+  void recordMangledNameOfMemberMethod(MemberEntity member, jsAst.Name name) {
     if (backend.isInterceptedMethod(member)) {
       interceptorInvocationNames.add(name);
     }
   }
 
   jsAst.Expression buildGetInterceptorMethod(
-      jsAst.Name key, Set<ClassElement> classes) {
+      jsAst.Name key, Set<ClassEntity> classes) {
     InterceptorStubGenerator stubGenerator =
         new InterceptorStubGenerator(compiler, namer, backend, closedWorld);
     jsAst.Expression function =
@@ -46,11 +43,11 @@ class InterceptorEmitter extends CodeEmitterHelper {
 
     parts.add(js.comment('getInterceptor methods'));
 
-    Map<jsAst.Name, Set<ClassElement>> specializedGetInterceptors =
+    Map<jsAst.Name, Set<ClassEntity>> specializedGetInterceptors =
         backend.specializedGetInterceptors;
     List<jsAst.Name> names = specializedGetInterceptors.keys.toList()..sort();
     for (jsAst.Name name in names) {
-      Set<ClassElement> classes = specializedGetInterceptors[name];
+      Set<ClassEntity> classes = specializedGetInterceptors[name];
       parts.add(js.statement('#.# = #', [
         namer.globalObjectFor(backend.helpers.interceptorsLibrary),
         name,
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart
index c489cb579ee..472a2c7c5cd 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart
@@ -4,16 +4,10 @@
 
 library dart2js.js_emitter.full_emitter.nsm_emitter;
 
-import '../../elements/elements.dart'
-    show
-    ClassElement,
-    MemberElement;
+import '../../elements/entities.dart';
 import '../../js/js.dart' as jsAst;
 import '../../js/js.dart' show js;
-import '../../js_backend/js_backend.dart'
-    show
-    GetterName,
-    SetterName;
+import '../../js_backend/js_backend.dart' show GetterName, SetterName;
 import '../../universe/selector.dart' show Selector;
 import '../../util/characters.dart' show $$, $A, $HASH, $Z, $a, $z;
 import '../../world.dart' show ClosedWorld;
@@ -78,7 +72,7 @@ class NsmEmitter extends CodeEmitterHelper {
         if (reflectionName != null) {
           bool accessible = closedWorld.allFunctions
               .filter(selector, null)
-              .any((MemberElement e) => backend.isAccessibleByReflection(e));
+              .any(backend.isMemberAccessibleByReflection);
           addProperty(
               namer.asName('+$reflectionName'), js(accessible ? '2' : '0'));
         }
@@ -179,7 +173,7 @@ class NsmEmitter extends CodeEmitterHelper {
     }
     // Startup code that loops over the method names and puts handlers on the
     // Object class to catch noSuchMethod invocations.
-    ClassElement objectClass = compiler.commonElements.objectClass;
+    ClassEntity objectClass = compiler.commonElements.objectClass;
     jsAst.Expression createInvocationMirror = backend.emitter
         .staticFunctionAccess(backend.helpers.createInvocationMirror);
     if (useDiffEncoding) {