Use entities in some full_emitter sublibraries

pkg/compiler/lib/src/js_emitter/full_emitter/class_builder.dart

Index: pkg/compiler/lib/src/js_emitter/full_emitter/class_builder.dart
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 a452dd5b7290b24c2c1b0f9299f794a2c438c3b5..f0167e1aea3472096bab8e9e282e625c2e77f416 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;