Remove 'initializeTestEnvironment' from 'analyzer'.

pkg/analyzer/test/source/sdk_ext_test.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.
 
 library analyzer.test.source.sdk_ext_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/sdk_ext.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
-import '../utils.dart';
-
 main() {
-  initializeTestEnvironment();
   defineReflectiveSuite(() {
     defineReflectiveTests(SdkExtUriResolverTest);
   });
 }
 
 @reflectiveTest
 class SdkExtUriResolverTest {
   MemoryResourceProvider resourceProvider;
 
   void setUp() {
@@ skipping 51 matching lines @@
     expect(source, isNotNull);
     // Restore source's uri.
     var restoreUri = resolver.restoreAbsolute(source);
     expect(restoreUri, isNotNull);
     // Verify that it is 'dart:fox'.
     expect(restoreUri.toString(), equals('dart:fox'));
     expect(restoreUri.scheme, equals('dart'));
     expect(restoreUri.path, equals('fox'));
   }
 }