Disable spawn shutdown test

related #25351

R=asiva@google.com

Review URL: https://codereview.chromium.org/1558323002 .
diff --git a/runtime/tests/vm/vm.status b/runtime/tests/vm/vm.status
index 40a5cb6..7a914be 100644
--- a/runtime/tests/vm/vm.status
+++ b/runtime/tests/vm/vm.status
@@ -14,6 +14,8 @@
 
 dart/data_uri_import_test/none: SkipByDesign
 
+dart/spawn_shutdown_test: Skip # Issue 25351
+
 [ $mode == debug ]
 # This is a benchmark that is not informative in debug mode.
 cc/CorelibIsolateStartup: Skip
@@ -90,4 +92,4 @@
 
 [ $runtime == dart_precompiled ]
 dart/optimized_stacktrace_test: Fail
-dart/data_uri_spawn_test: RuntimeError # Isolate.spawnUri
\ No newline at end of file
+dart/data_uri_spawn_test: RuntimeError # Isolate.spawnUri