Revert "Remaining private libs"

sdk/lib/_internal/js_runtime/lib/js_array.dart

 // Copyright (c) 2012, 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.
 
-part of "dart:_interceptors";
+part of "interceptors.dart";
 
 class _Growable {
   const _Growable();
 }
 
 const _ListConstructorSentinel = const _Growable();
 
 /**
  * The interceptor class for [List]. The compiler recognizes this
  * class as an interceptor, and changes references to [:this:] to
@@ skipping 658 matching lines @@
 
     if (_index >= length) {
       _current = null;
       return false;
     }
     _current = _iterable[_index];
     _index++;
     return true;
   }
 }