Status file cleanup.

Change-Id: Ifeb56e7ec7319ec9834b1888f09f0726c1b5a6e3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/116486
Commit-Queue: Bob Nystrom <rnystrom@google.com>
Auto-Submit: Mayank Patke <fishythefish@google.com>
Reviewed-by: Bob Nystrom <rnystrom@google.com>

tests/language_2/language_2_analyzer.status

@@ -7,7 +7,6 @@
 [ $compiler == dart2analyzer ]
 generic_no_such_method_dispatcher_simple_test: Skip # failing-by-design: This test is just for kernel
 large_class_declaration_test: Slow
-regress_23408_test: Skip # don't care about the static warning.
 vm/debug_break_enabled_vm_test: Skip
 vm/debug_break_vm_test/*: Skip
 vm/regress_27201_test: SkipByDesign # Loads bad library, so will always crash.