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

pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
index 457cd6b5212ade3895f67882ff9323f071c0c4e7..7f8e8453794536626c0578ac5a198538fc577ea6 100644
--- a/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/startup_emitter/emitter.dart
@@ -10,28 +10,29 @@ import 'package:js_runtime/shared/embedded_names.dart' show
     STATIC_FUNCTION_NAME_TO_CLOSURE,
     TYPES;
 
-import '../program_builder/program_builder.dart' show ProgramBuilder;
-import '../model.dart';
-import 'model_emitter.dart';
 import '../../common.dart';
-import '../../elements/elements.dart' show FieldElement;
+import '../../compiler.dart' show
+    Compiler;
+import '../../constants/values.dart' show
+    ConstantValue;
+import '../../elements/elements.dart' show
+    ClassElement,
+    Element,
+    FieldElement,
+    FunctionElement;
 import '../../js/js.dart' as js;
-
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
     Namer;
 
 import '../js_emitter.dart' show
     NativeEmitter;
-
 import '../js_emitter.dart' as emitterTask show
     Emitter;
+import '../program_builder/program_builder.dart' show ProgramBuilder;
+import '../model.dart';
 
-import '../../diagnostics/diagnostic_listener.dart' show
-    DiagnosticReporter;
-
-import '../../diagnostics/spannable.dart' show
-    NO_LOCATION_SPANNABLE;
+import 'model_emitter.dart';
 
 class Emitter implements emitterTask.Emitter {
   final Compiler _compiler;