Fix remaining dependency of dummy_compiler_test after this filed was moved.

TBR=johnniwinther@google.com
CC=jwren@google.com

Review-Url: https://codereview.chromium.org/2991543002 .
diff --git a/tests/compiler/dart2js/analyze_only_test.dart b/tests/compiler/dart2js/analyze_only_test.dart
index f07e5b2..bb5a2c3 100644
--- a/tests/compiler/dart2js/analyze_only_test.dart
+++ b/tests/compiler/dart2js/analyze_only_test.dart
@@ -17,7 +17,7 @@
 import 'package:compiler/src/old_to_new_api.dart';
 import 'package:compiler/src/options.dart';
 
-import 'dummy_compiler_test.dart' as dummy;
+import '../dart2js_extra/dummy_compiler_test.dart' as dummy;
 import 'output_collector.dart';
 
 runCompiler(String main, List<String> options,