sdk files reorganization to make dart2js a proper package

pkg/compiler/lib/src/js_emitter/new_emitter/model_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.new_js_emitter.model_emitter;
 
 import '../../constants/values.dart' show ConstantValue, FunctionConstantValue;
 import '../../dart2jslib.dart' show Compiler;
 import '../../elements/elements.dart' show ClassElement, FunctionElement;
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
     Namer,
     ConstantEmitter;
 
 import '../js_emitter.dart' show AstContainer, NativeEmitter;
 
-import 'package:_internal/compiler/js_lib/shared/embedded_names.dart' show
+import 'package:js_runtime/shared/embedded_names.dart' show
     CREATE_NEW_ISOLATE,
     DEFERRED_LIBRARY_URIS,
     DEFERRED_LIBRARY_HASHES,
     GET_TYPE_FROM_NAME,
     INITIALIZE_LOADED_HUNK,
     INTERCEPTORS_BY_TAG,
     IS_HUNK_INITIALIZED,
     IS_HUNK_LOADED,
     LEAF_TAGS,
     MANGLED_GLOBAL_NAMES,
@@ skipping 1247 matching lines @@
 
   var end = Date.now();
   // print('Setup: ' + (end - start) + ' ms.');
 
   #invokeMain;  // Start main.
 
 })(Date.now(), #code)
 }""";
 
 }