Allow BLOCK_SHUTDOWN tasks during shutdown with SequencedWorkerPool redirected to TaskScheduler.

base/threading/sequenced_worker_pool.cc

Index: base/threading/sequenced_worker_pool.cc
diff --git a/base/threading/sequenced_worker_pool.cc b/base/threading/sequenced_worker_pool.cc
index c179a039f2f7e1877a530ed4d67e24f75635a47c..d856c3a70b7cbc9c2e0e20908de519b3d0d1ce97 100644
--- a/base/threading/sequenced_worker_pool.cc
+++ b/base/threading/sequenced_worker_pool.cc
@@ -924,11 +924,12 @@ void SequencedWorkerPool::Inner::Shutdown(
       return;
     shutdown_called_ = true;
 
+    max_blocking_tasks_after_shutdown_ = max_new_blocking_tasks_after_shutdown;
+
     if (subtle::NoBarrier_Load(&g_all_pools_state) !=
-        AllPoolsState::WORKER_CREATED)
+        AllPoolsState::WORKER_CREATED) {
       return;
-
-    max_blocking_tasks_after_shutdown_ = max_new_blocking_tasks_after_shutdown;
+    }
 
     // Tickle the threads. This will wake up a waiting one so it will know that
     // it can exit, which in turn will wake up any other waiting ones.