Remove 'initializeTestEnvironment' from 'analyzer'.

pkg/analyzer/test/source/package_map_provider_test.dart

Index: pkg/analyzer/test/source/package_map_provider_test.dart
diff --git a/pkg/analyzer/test/source/package_map_provider_test.dart b/pkg/analyzer/test/source/package_map_provider_test.dart
index 3eda50ec5641e6ece7c04fbd20a37d9067392fee..68a1eba5cefc0bc141ec584b673ed3a398861cd6 100644
--- a/pkg/analyzer/test/source/package_map_provider_test.dart
+++ b/pkg/analyzer/test/source/package_map_provider_test.dart
@@ -13,10 +13,7 @@ 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);
   });