Remove 'initializeTestEnvironment' from 'analyzer'.

pkg/analyzer/test/source/package_map_provider_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.source.package_map_provider_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_provider.dart';
 import 'package:analyzer/source/pub_package_map_provider.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
-import '../utils.dart';
-
 main() {
-  initializeTestEnvironment();
   defineReflectiveSuite(() {
     defineReflectiveTests(PubPackageMapProviderTest);
   });
 }
 
 @reflectiveTest
 class PubPackageMapProviderTest {
   static const String projectPath = '/path/to/project';
 
   DartSdk sdk;
@@ skipping 104 matching lines @@
     resourceProvider.newFolder(projectPath);
     resourceProvider.newFile(dependencyPath, 'contents');
     Set<String> dependencies = parsePackageMap({
       'packages': {},
       'input_files': [relativeDependencyPath]
     }).dependencies;
     expect(dependencies, hasLength(1));
     expect(dependencies, contains(dependencyPath));
   }
 }