Use memory compiler in compiler_helper.dart.

tests/compiler/dart2js/message_kind_helper.dart

Index: tests/compiler/dart2js/message_kind_helper.dart
diff --git a/tests/compiler/dart2js/message_kind_helper.dart b/tests/compiler/dart2js/message_kind_helper.dart
index af32b58ceb8e621f9707769cb6ccef2dfeb865ef..12089cfcb91c7005ef602416cf4d52c6d70e7aa8 100644
--- a/tests/compiler/dart2js/message_kind_helper.dart
+++ b/tests/compiler/dart2js/message_kind_helper.dart
@@ -7,6 +7,7 @@ library dart2js.test.message_kind_helper;
 import 'package:expect/expect.dart';
 import 'dart:async';
 
+import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/compiler.dart' show
     Compiler;
 import 'package:compiler/src/dart_backend/dart_backend.dart' show
@@ -84,8 +85,8 @@ Future<Compiler> check(MessageTemplate template, Compiler cachedCompiler) {
     Compiler compiler = compilerFor(
         memorySourceFiles: example,
         diagnosticHandler: new LegacyCompilerDiagnostics(collect),
-        options: ['--analyze-only',
-                  '--enable-experimental-mirrors']..addAll(template.options),
+        options: [Flags.analyzeOnly,
+                  Flags.enableExperimentalMirrors]..addAll(template.options),
         cachedCompiler:
              // TODO(johnniwinther): Remove this restriction when constant
              // values can be computed directly from the expressions.