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

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index bcfe08c6471fced2c77062e921b77c0f9e934c0d..c31c255fad35df059bfe5428fec957e243082c4e 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -387,7 +387,6 @@ class BinaryBuilder {
       _skipNodeList(readExpression);
     }
     _readLibraryDependencies(library);
-    _readAdditionalExports(library);
     _readLibraryParts(library);
     _mergeNamedNodeList(library.typedefs, readTypedef, library);
     _mergeNamedNodeList(library.classes, readClass, library);
@@ -418,17 +417,6 @@ class BinaryBuilder {
     }
   }
 
-  void _readAdditionalExports(Library library) {
-    int numExportedReference = readUInt();
-    if (numExportedReference != 0) {
-      for (int i = 0; i < numExportedReference; i++) {
-        CanonicalName exportedName = readCanonicalNameReference();
-        Reference reference = exportedName.getReference();
-        library.additionalExports.add(reference);
-      }
-    }
-  }
-
   Combinator readCombinator() {
     var isShow = readUInt() == 1;
     var names = readStringReferenceList();