Use memory compiler in compiler_helper.dart.

tests/compiler/dart2js/in_user_code_test.dart

Index: tests/compiler/dart2js/in_user_code_test.dart
diff --git a/tests/compiler/dart2js/in_user_code_test.dart b/tests/compiler/dart2js/in_user_code_test.dart
index 98704916f7a8b91feba188afd0eb030c4e700e4a..0a6e13f2fbe337d61f15b35ea86c5d040b58185e 100644
--- a/tests/compiler/dart2js/in_user_code_test.dart
+++ b/tests/compiler/dart2js/in_user_code_test.dart
@@ -7,6 +7,7 @@
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
+import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/compiler.dart' show Compiler;
 import 'memory_compiler.dart';
 
@@ -47,7 +48,7 @@ Future test(List<Uri> entryPoints, Map<String, bool> expectedResults) async {
   CompilationResult result = await runCompiler(
     entryPoints: entryPoints,
     memorySourceFiles: SOURCE,
-    options: ['--analyze-only', '--analyze-all'],
+    options: [Flags.analyzeOnly, Flags.analyzeAll],
     packageRoot: Uri.parse('memory:pkg/'));
   Compiler compiler = result.compiler;
   expectedResults.forEach((String uri, bool expectedResult) {