Remove Fasta's copy of accessors.dart.

pkg/kernel/lib/transformations/closure/converter.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.
 
 library kernel.transformations.closure.converter;
 
 import '../../ast.dart'
     show
         Arguments,
         Block,
@@ skipping 248 matching lines @@
     Statement body = function.body;
     assert(body != null);
 
     rewriter = makeRewriterForBody(function);
 
     VariableDeclaration contextVariable = new VariableDeclaration(
         "#contextParameter",
         type: contextClass.rawType,
         isFinal: true);
     Context parent = context;
-    context = context.toNestedContext(new VariableAccessor(contextVariable));
+    context = context.toNestedContext(
+        new VariableAccessor(contextVariable, null, TreeNode.noOffset));
 
     Set<TypeParameter> captured = capturedTypeVariables[currentFunction];
     if (captured != null) {
       typeSubstitution = copyTypeVariables(captured);
     } else {
       typeSubstitution = const <TypeParameter, DartType>{};
     }
 
     function.transformChildren(this);
 
@@ skipping 553 matching lines @@
   // TODO(ahe): Remove this method when we don't generate closure classes
   // anymore.
   void addClosureClassNote(Class closureClass) {
     closureClass.addMember(new Field(new Name("note"),
         type: coreTypes.stringClass.rawType,
         initializer: new StringLiteral(
             "This is temporary. The VM doesn't need closure classes."),
         fileUri: currentFileUri));
   }
 }