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

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

 // Copyright (c) 2014, 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 dart2js.js_emitter.lazy_emitter;
 
 import 'package:js_runtime/shared/embedded_names.dart' show
     JsBuiltin,
     METADATA,
     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 '../model.dart';
+import '../program_builder/program_builder.dart' show
+    ProgramBuilder;
 
-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;
   final Namer namer;
   final ModelEmitter _emitter;
 
   JavaScriptBackend get _backend => _compiler.backend;
 
   Emitter(Compiler compiler, Namer namer, NativeEmitter nativeEmitter)
       : this._compiler = compiler,
@@ skipping 144 matching lines @@
         reporter.internalError(NO_LOCATION_SPANNABLE,
                                 "Unhandled Builtin: $builtin");
         return null;
     }
   }
 
   @override
   void invalidateCaches() {
   }
 }