Stop working around issue 9020 in scheduled_test.

pkg/scheduled_test/lib/scheduled_process.dart

 // Copyright (c) 2013, 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 scheduled_test.scheduled_process;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'scheduled_test.dart';
@@ skipping 133 matching lines @@
       ]).then((results) {
         executable = results[0];
         arguments = results[1];
         workingDirectory = results[2];
         environment = results[3];
         _updateDescription(executable, arguments);
         return Process.start(executable,
                              arguments,
                              workingDirectory: workingDirectory,
                              environment: environment).then((process) {
-          // TODO(nweiz): enable this when issue 9020 is fixed.
-          // process.stdin.encoding = Encoding.UTF_8;
+          process.stdin.encoding = Encoding.UTF_8;
           return process;
         });
       });
     }, "starting process '$description'"));
   }
 
   /// Listens for [_process] to exit and passes the exit code to
   /// [exitCodeCompleter]. If the process completes earlier than expected, an
   /// exception will be signaled to the schedule.
   void _handleExit(Completer exitCodeCompleter) {
@@ skipping 179 matching lines @@
     schedule(() {
       _endExpected = true;
       return _exitCode.then((exitCode) {
         if (expectedExitCode != null) {
           expect(exitCode, equals(expectedExitCode));
         }
       });
     }, "waiting for process '$description' to exit");
   }
 }