sdk files reorganization to make dart2js a proper package

pkg/dart2js_incremental/lib/library_updater.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_incremental.library_updater;
 
 import 'dart:async' show
     Future;
 
 import 'dart:convert' show
@@ skipping 55 matching lines @@
     MemberInfo,
     computeMixinClass;
 
 import 'package:compiler/src/js_emitter/model.dart' show
     Class,
     Method;
 
 import 'package:compiler/src/js_emitter/program_builder.dart' show
     ProgramBuilder;
 
-import 'package:_internal/compiler/js_lib/shared/embedded_names.dart'
+import 'package:js_runtime/shared/embedded_names.dart'
     as embeddedNames;
 
 import 'package:compiler/src/js_backend/js_backend.dart' show
     JavaScriptBackend,
     Namer;
 
 import 'package:compiler/src/util/util.dart' show
     Link,
     LinkBuilder;
 
@@ skipping 1400 matching lines @@
         .buildFieldsHackForIncrementalCompilation(classElement);
     // TODO(ahe): Rewrite for new emitter.
     ClassBuilder builder = new ClassBuilder(classElement, namer);
     classEmitter.emitFields(cls, builder);
     return builder.fields;
   }
 }
 
 // TODO(ahe): Remove this method.
 NO_WARN(x) => x;