Mark deferred loading test as failing for vm-kernel-precompiled

This is a known issue, see dartbug.com/28335

R=kmillikin@google.com

Review-Url: https://codereview.chromium.org/2681123003 .
diff --git a/tests/language/language_kernel.status b/tests/language/language_kernel.status
index c53b287..fc6bb7c 100644
--- a/tests/language/language_kernel.status
+++ b/tests/language/language_kernel.status
@@ -222,7 +222,7 @@
 
 # dartk: precompilation failures
 [ $compiler == dartkp && $runtime == dart_precompiled ]
-if_null_assignment_static_test/35: Crash  # Dartk Issue 28302
+deferred_regression_28678_test: RuntimeError # Issue 28335
 
 # dartk: precompilation failures (debug)
 [ $compiler == dartkp && $runtime == dart_precompiled && $mode == debug ]