[ package:vm_service ] Fix capture_stdio_test on Windows

TEST=pkg/vm-service/test/capture_stdio_test.dart

Change-Id: Iaecd5c3535f7aaf632f59973236aba056bb01506
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/188641
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
diff --git a/pkg/vm_service/test/capture_stdio_test.dart b/pkg/vm_service/test/capture_stdio_test.dart
index 1244e65..2edf76c 100644
--- a/pkg/vm_service/test/capture_stdio_test.dart
+++ b/pkg/vm_service/test/capture_stdio_test.dart
@@ -50,7 +50,7 @@
       if (eventNumber == 1) {
         expect(decoded, 'print');
       } else if (eventNumber == 2) {
-        expect(decoded, Platform.isWindows ? '\r\n' : '\n');
+        expect(decoded, '\n');
         await service.streamCancel(EventStreams.kStdout);
         await stdoutSub.cancel();
         completer.complete();