Remove 'initializeTestEnvironment' from 'analyzer'.

pkg/analyzer/test/dart/ast/visitor_test.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.test.dart.ast.visitor_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../generated/parser_test.dart' show ParserTestCase;
 import '../../generated/test_support.dart';
-import '../../utils.dart';
 
 main() {
-  initializeTestEnvironment();
   defineReflectiveSuite(() {
     defineReflectiveTests(BreadthFirstVisitorTest);
   });
 }
 
 @reflectiveTest
 class BreadthFirstVisitorTest extends ParserTestCase {
   void test_it() {
     String source = r'''
 class A {
@@ skipping 44 matching lines @@
   List<AstNode> nodes;
 
   _BreadthFirstVisitorTestHelper(this.nodes) : super();
 
   @override
   Object visitNode(AstNode node) {
     nodes.add(node);
     return super.visitNode(node);
   }
 }