Clean up some supposedly failing tests

pkg/analyzer/lib/src/dart/ast/utilities.dart

 // Copyright (c) 2014, 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 analyzer.src.dart.ast.utilities;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 2483 matching lines @@
   Element visitClassDeclaration(ClassDeclaration node) => node.element;
 
   @override
   Element visitCompilationUnit(CompilationUnit node) => node.element;
 
   @override
   Element visitConstructorDeclaration(ConstructorDeclaration node) =>
       node.element;
 
   @override
+  Element visitExportDirective(ExportDirective node) => node.element;
+
+  @override
   Element visitFunctionDeclaration(FunctionDeclaration node) => node.element;
 
   @override
   Element visitIdentifier(Identifier node) {
     AstNode parent = node.parent;
     if (parent is Annotation) {
       // Type name in Annotation
       if (identical(parent.name, node) && parent.constructorName == null) {
         return parent.element;
       }
@@ skipping 11 matching lines @@
           return element.unnamedConstructor;
         }
       }
     } else if (parent is LibraryIdentifier) {
       AstNode grandParent = parent.parent;
       if (grandParent is PartOfDirective) {
         Element element = grandParent.element;
         if (element is LibraryElement) {
           return element.definingCompilationUnit;
         }
+      } else if (grandParent is LibraryDirective) {
+        return grandParent.element;
       }
     }
     return node.bestElement;
   }
 
   @override
   Element visitImportDirective(ImportDirective node) => node.element;
 
   @override
   Element visitIndexExpression(IndexExpression node) => node.bestElement;
@@ skipping 5241 matching lines @@
    * Safely visit the given [token], printing the [suffix] after the token if it
    * is non-`null`.
    */
   void _visitTokenWithSuffix(Token token, String suffix) {
     if (token != null) {
       _writer.print(token.lexeme);
       _writer.print(suffix);
     }
   }
 }