Fix remaining dependency of dummy_compiler_test after this filed was moved.

tests/compiler/dart2js/analyze_only_test.dart

 // Copyright (c) 2012, 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.
 
 // Smoke test of the dart2js compiler API.
 library analyze_only;
 
 import 'dart:async';
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/diagnostics/messages.dart'
     show MessageKind, MessageTemplate;
 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,
     onValue(String code, List errors, List warnings)) {
   List errors = new List();
   List warnings = new List();
 
   Future<String> localProvider(Uri uri) {
     if (uri.scheme != 'main') return dummy.provider(uri);
     return new Future<String>.value(main);
@@ skipping 152 matching lines @@
   runCompiler(
       """main() {}
       foo() native 'foo';""",
       [Flags.analyzeOnly], (String code, List errors, List warnings) {
     Expect.isNull(code);
     Expect.isTrue(
         errors.single.startsWith("'native' modifier is not supported."));
     Expect.isTrue(warnings.isEmpty);
   });
 }