Big merge from experimental to bleeding edge.

tests/standalone/io/test_extension_fail_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.
 //
 // Dart test program for testing native extensions.
 
 import "dart:io";
 
 Future copyFileToDirectory(Path file, Path directory) {
   String src = file.toNativePath();
@@ skipping 26 matching lines @@
   Options options = new Options();
 
   Path scriptDirectory = new Path.fromNative(options.script).directoryPath;
   Path buildDirectory = new Path.fromNative(options.executable).directoryPath;
   Directory tempDirectory = new Directory('').createTempSync();
   Path testDirectory = new Path.fromNative(tempDirectory.path);
 
   // Copy test_extension shared library, test_extension.dart and
   // test_extension_fail_tester.dart to the temporary test directory.
   copyFileToDirectory(getExtensionPath(buildDirectory),
-                      testDirectory).chain((_) {
+                      testDirectory).then((_) {
     Path extensionDartFile = scriptDirectory.append('test_extension.dart');
     return copyFileToDirectory(extensionDartFile, testDirectory);
-  }).chain((_) {
+  }).then((_) {
     Path testExtensionTesterFile =
         scriptDirectory.append('test_extension_fail_tester.dart');
     return copyFileToDirectory(testExtensionTesterFile, testDirectory);
-  }).chain((_) {
+  }).then((_) {
     Path script = testDirectory.append('test_extension_fail_tester.dart');
     return Process.run(options.executable, [script.toNativePath()]);
-  })..then((ProcessResult result) {
+  }).then((ProcessResult result) {
     print("ERR: ${result.stderr}\n\n");
     print("OUT: ${result.stdout}\n\n");
     Expect.equals(255, result.exitCode);
     Expect.isTrue(result.stderr.contains("Unhandled exception:\nball\n"));
-    tempDirectory.deleteSync(recursive: true);
-  })..handleException((_) {
-    tempDirectory.deleteSync(recursive: true);
-  });
+  }).whenComplete(() => tempDirectory.deleteSync(recursive: true));
 }