Correctly mark generic failures as RuntimeError for Dartium

tests/language/language.status

Index: tests/language/language.status
diff --git a/tests/language/language.status b/tests/language/language.status
index b480394b9b583a6778eb6d6d2f9fd9c49e3f1bb0..ff38b0904b1ed134ead2caef7a3b4d116ccab014 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -89,6 +89,10 @@ main_test/21: Fail # Issue 20028
 main_test/42: Fail # Issue 20028
 mirror_in_static_init_test: Fail # Issue 22071
 vm/debug_break_enabled_vm_test/*: Skip # Issue 14651.
+# Experimental feature: Syntactic support for generic methods.
+generic_methods_test: RuntimeError # Issue 25869
+generic_functions_test: RuntimeError # Issue 25869
+generic_sends_test: RuntimeError # Issue 25869
 
 [ $compiler == none && $runtime == dartium && $system == linux && $arch != x64 ]
 issue_22780_test/01 : Pass, Timeout # Issue 24473