Remove 'initializeTestEnvironment' from 'analyzer'.

pkg/analyzer/test/generated/utilities_dart_test.dart

 // Copyright (c) 2016, 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.generated.utilities_dart_test;
 
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
-import '../utils.dart';
-
 main() {
-  initializeTestEnvironment();
   defineReflectiveSuite(() {
     defineReflectiveTests(ResolveRelativeUriTest);
   });
 }
 
 @reflectiveTest
 class ResolveRelativeUriTest {
   void test_absolute() {
     _validate('dart:core', 'dart:async', 'dart:async');
     _validate('package:foo/foo.dart', 'dart:async', 'dart:async');
@@ skipping 19 matching lines @@
     // TODO(scheglov) After https://github.com/dart-lang/sdk/issues/27447
     // TODO(scheglov) include also this, currently failing test.
 //    _validate('a/b.dart', '../../c.dart', '../c.dart');
   }
 
   void _validate(String base, String contained, String expected) {
     Uri actual = resolveRelativeUri(Uri.parse(base), Uri.parse(contained));
     expect(actual.toString(), expected);
   }
 }