Handle deferred access as pre-step in SemanticSendVisitor.

tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart

 // Copyright (c) 2015, 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 dart2js.semantics_visitor_test;
 
 class SemanticSendTestVisitor extends SemanticTestVisitor {
 
   SemanticSendTestVisitor(TreeElements elements) : super(elements);
 
@@ skipping 2922 matching lines @@
   visitConstantInvoke(
       Send node,
       ConstantExpression constant,
       NodeList arguments,
       CallStructure callStructure,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_CONSTANT_INVOKE,
         constant: constant.getText()));
     super.visitConstantInvoke(node, constant, arguments, callStructure, arg);
   }
+
+  @override
+  previsitDeferredAccess(
+      Send node,
+      PrefixElement prefix,
+      arg) {
+    visits.add(new Visit(VisitKind.PREVISIT_DEFERRED_ACCESS, element: prefix));
+  }
 }