Stop working around issue 9020 in scheduled_test.

pkg/scheduled_test/lib/scheduled_process.dart

Index: pkg/scheduled_test/lib/scheduled_process.dart
diff --git a/pkg/scheduled_test/lib/scheduled_process.dart b/pkg/scheduled_test/lib/scheduled_process.dart
index 75891a9df581991a371fd0315f2164ae2c02e082..4508f54ed3204d028e36ecd2a83e1ad95c3133ae 100644
--- a/pkg/scheduled_test/lib/scheduled_process.dart
+++ b/pkg/scheduled_test/lib/scheduled_process.dart
@@ -151,8 +151,7 @@ class ScheduledProcess {
                              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;
         });
       });