Use common.dart to re-export commonly used entities.

pkg/compiler/lib/src/js_emitter/model.dart

Index: pkg/compiler/lib/src/js_emitter/model.dart
diff --git a/pkg/compiler/lib/src/js_emitter/model.dart b/pkg/compiler/lib/src/js_emitter/model.dart
index 15a12711c882c643bd6db9e35f9300202a94f725..29ad8aeabab5df5e45a1023461934eead87b707a 100644
--- a/pkg/compiler/lib/src/js_emitter/model.dart
+++ b/pkg/compiler/lib/src/js_emitter/model.dart
@@ -4,16 +4,22 @@
 
 library dart2js.new_js_emitter.model;
 
-import '../js/js.dart' as js show Expression, Statement, Name, Literal,
+import '../common.dart';
+import '../constants/values.dart' show
+    ConstantValue;
+import '../deferred_load.dart' show
+    OutputUnit;
+import '../elements/elements.dart' show
+    Element;
+import '../js/js.dart' as js show
+    Expression,
+    Literal,
+    Name,
+    Statement,
     TokenFinalizer;
-import '../constants/values.dart' show ConstantValue;
-
-import '../deferred_load.dart' show OutputUnit;
 
 import 'js_emitter.dart' show MetadataCollector;
 
-import '../common.dart';
-
 class Program {
   final List<Fragment> fragments;
   final List<Holder> holders;