dart2js: Add failing test for Function.apply on normal class with `call`.

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
diff --git a/tests/language/language_dart2js.status b/tests/language/language_dart2js.status
index b6ce53496bbcd8740ad59f0efefed5f0c5aa50b2..0a709b95a925ad6f12a5768b44e89f7cabd6058a 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -14,6 +14,8 @@ async_star_test/05: RuntimeError, Timeout
 try_catch_on_syntax_test/10: Fail # Issue 19823
 try_catch_on_syntax_test/11: Fail # Issue 19823
 
+call_function_apply_test: RuntimeError # Issue 23873
+
 [ $compiler == dart2js && $runtime == jsshell ]
 await_for_test: Skip # Jsshell does not provide periodic timers, Issue 7728
 async_star_test: RuntimeError # Jsshell does not provide non-zero timers, Issue 7728