Use memory compiler in compiler_helper.dart.

tests/compiler/dart2js/in_user_code_test.dart

 // Copyright (c) 2014, 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.
 
 // Test that the helper [Compiler.inUserCode] works as intended.
 
 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';
 
 const SOURCE = const {
   'main.dart': """
 library main;
 
 import 'dart:async';
 import 'foo.dart';
 import 'pkg/sub/bar.dart';
@@ skipping 20 matching lines @@
 
   'pkg/sup/boz.dart': """
 library sup.boz;
 """,
 };
 
 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) {
     var element = compiler.libraryLoader.lookupLibrary(Uri.parse(uri));
     Expect.isNotNull(element, "Unknown library '$uri'.");
     Expect.equals(expectedResult, compiler.inUserCode(element),
         expectedResult ? "Library '$uri' expected to be in user code"
                        : "Library '$uri' not expected to be in user code");
   });
 }
@@ skipping 32 matching lines @@
        'dart:core': false});
   await test(
       [Uri.parse('dart:async'), Uri.parse('package:sub/bar.dart')],
       {'package:sub/bar.dart': true,
        'package:sub/baz.dart': true,
        'package:sup/boz.dart': false,
        'dart:core': true,
        'dart:async': true});
 }