Remove 'initializeTestEnvironment' from 'analyzer'.

pkg/analyzer/test/cancelable_future_test.dart

Index: pkg/analyzer/test/cancelable_future_test.dart
diff --git a/pkg/analyzer/test/cancelable_future_test.dart b/pkg/analyzer/test/cancelable_future_test.dart
index e01e732e7bbd88ff7196b7b37521a5353f53b952..8f38b6a2fbe0f5363ee582be01da49158196cbe9 100644
--- a/pkg/analyzer/test/cancelable_future_test.dart
+++ b/pkg/analyzer/test/cancelable_future_test.dart
@@ -11,10 +11,7 @@ import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:watcher/src/utils.dart';
 
-import 'utils.dart';
-
 void main() {
-  initializeTestEnvironment();
   defineReflectiveSuite(() {
     defineReflectiveTests(CancelableCompleterTests);
     defineReflectiveTests(CancelableFutureTests);