Revert "Store actual Reference(s) for additional exports."

pkg/kernel/lib/ast.dart

 // Copyright (c) 2016, 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.
 
 /// -----------------------------------------------------------------------
 ///                           ERROR HANDLING
 /// -----------------------------------------------------------------------
 ///
 /// As a rule of thumb, errors that can be detected statically are handled by
 /// the frontend, typically by translating the erroneous code into a 'throw' or
@@ skipping 251 matching lines @@
   /// other than [ClassLevel.Body].  Members in an external library have no
   /// body, but have their typed interface present.
   ///
   /// If the libary is non-external, then its classes are at [ClassLevel.Body]
   /// and all members are loaded.
   bool isExternal;
 
   String name;
   final List<Expression> annotations;
   final List<LibraryDependency> dependencies;
-
-  /// References to nodes exported by `export` declarations that:
-  /// - aren't ambiguous, or
-  /// - aren't hidden by local declarations.
-  final List<Reference> additionalExports = <Reference>[];
-
   @informative
   final List<LibraryPart> parts;
   final List<Typedef> typedefs;
   final List<Class> classes;
   final List<Procedure> procedures;
   final List<Field> fields;
 
   Library(this.importUri,
       {this.name,
       this.isExternal: false,
@@ skipping 4668 matching lines @@
   if (typedef_.canonicalName == null) {
     throw '$typedef_ has no canonical name';
   }
   return typedef_.canonicalName;
 }
 
 /// Annotation describing information which is not part of Dart semantics; in
 /// other words, if this information (or any information it refers to) changes,
 /// static analysis and runtime behavior of the library are unaffected.
 const informative = null;