Fix type argument for Result.

pkg/testing/lib/src/stdio_process.dart

Index: pkg/testing/lib/src/stdio_process.dart
diff --git a/pkg/testing/lib/src/stdio_process.dart b/pkg/testing/lib/src/stdio_process.dart
index 8fff926c3d45542256fa6d4cadfd97e94351d790..6a2554109702a860527e1c00702236c4636ad400 100644
--- a/pkg/testing/lib/src/stdio_process.dart
+++ b/pkg/testing/lib/src/stdio_process.dart
@@ -27,7 +27,7 @@ class StdioProcess {
     if (exitCode == expected) {
       return new Result<int>.pass(exitCode);
     } else {
-      return new Result<Program>(
+      return new Result<int>(
           exitCode, ExpectationSet.Default["RuntimeError"], output, null);
     }
   }