Don't use "var" to introduce the deferred_initializer.

tests/compiler/dart2js_extra/deferred_custom_loader_lib.dart

Index: tests/compiler/dart2js_extra/deferred_custom_loader_lib.dart
diff --git a/pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/grizzly.dart b/tests/compiler/dart2js_extra/deferred_custom_loader_lib.dart
similarity index 87%
copy from pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/grizzly.dart
copy to tests/compiler/dart2js_extra/deferred_custom_loader_lib.dart
index d575643598c26036bc0e72a3592eeccc5d6eaf44..e8636078fd29a22beb9a84b16232df299e6f114d 100644
--- a/pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/grizzly.dart
+++ b/tests/compiler/dart2js_extra/deferred_custom_loader_lib.dart
@@ -2,6 +2,4 @@
 // 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 grizzly;
-
-class Bear {}
+foo() => 499;