Some more removals of dart:utf.

pkg/scheduled_test/lib/src/descriptor/file_descriptor.dart

Index: pkg/scheduled_test/lib/src/descriptor/file_descriptor.dart
diff --git a/pkg/scheduled_test/lib/src/descriptor/file_descriptor.dart b/pkg/scheduled_test/lib/src/descriptor/file_descriptor.dart
index ad304ed1b262fcc580cbd48d014297a943d7f25d..eca863ae772dadbe669266d36fe3715e57f422b3 100644
--- a/pkg/scheduled_test/lib/src/descriptor/file_descriptor.dart
+++ b/pkg/scheduled_test/lib/src/descriptor/file_descriptor.dart
@@ -5,9 +5,9 @@
 library descriptor.file;
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
 import 'dart:math' as math;
-import 'dart:utf';
 
 import 'package:path/path.dart' as path;
 
@@ -90,7 +90,7 @@ class _BinaryFileDescriptor extends FileDescriptor {
 
 class _StringFileDescriptor extends FileDescriptor {
   _StringFileDescriptor(String name, String contents)
-      : super._(name, encodeUtf8(contents));
+      : super._(name, UTF8.encode(contents));
 
   Future _validateNow(List<int> actualContents) {
     if (orderedIterableEquals(contents, actualContents)) return null;