Revert 24086 Update checked in binary to version 0.5.19.0

tools/testing/dart/multitest.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.
 
 library multitest;
 
 import "dart:async";
 import "dart:io";
 import "test_suite.dart";
 import "utils.dart";
@@ skipping 202 matching lines @@
 
   // Wait until all imports are copied before scheduling test cases.
   return Future.wait(futureCopies).then((_) {
     String baseFilename = filePath.filenameWithoutExtension;
     for (String key in tests.keys) {
       final Path multitestFilename =
           targetDir.append('${baseFilename}_$key.dart');
       final File file = new File.fromPath(multitestFilename);
 
       file.createSync();
-      RandomAccessFile openedFile = file.openSync(mode: FileMode.WRITE);
+      RandomAccessFile openedFile = file.openSync(FileMode.WRITE);
       openedFile.writeStringSync(tests[key]);
       openedFile.closeSync();
       Set<String> outcome = outcomes[key];
       bool enableFatalTypeErrors = outcome.contains('static type warning');
       bool hasRuntimeErrors = outcome.contains('runtime error');
       bool hasCompileError = outcome.contains('compile-time error');
       bool isNegativeIfChecked = outcome.contains('dynamic type error');
       doTest(multitestFilename,
              hasCompileError,
              hasRuntimeErrors,
@@ skipping 22 matching lines @@
     // TestSuite.forDirectory.
     split.removeLast();
   }
   String path = '${generatedTestDir.path}/${split.last}';
   Directory dir = new Directory(path);
   if (!dir.existsSync()) {
     dir.createSync();
   }
   return new Path(new File(path).fullPathSync());
 }