Update from https://crrev.com/327068

base/threading/sequenced_worker_pool.h

Index: base/threading/sequenced_worker_pool.h
diff --git a/base/threading/sequenced_worker_pool.h b/base/threading/sequenced_worker_pool.h
index 63c6204ebbb79bb80bd96fe79b31554b2b767ef8..0b6c5f9e392c06f8d9fd3297cd81ae918829bc45 100644
--- a/base/threading/sequenced_worker_pool.h
+++ b/base/threading/sequenced_worker_pool.h
@@ -320,12 +320,10 @@ class BASE_EXPORT SequencedWorkerPool : public TaskRunner {
   // Must be called from the same thread this object was constructed on.
   void Shutdown() { Shutdown(0); }
 
-  // A variant that allows an arbitrary number of new blocking tasks to
-  // be posted during shutdown from within tasks that execute during shutdown.
-  // Only tasks designated as BLOCKING_SHUTDOWN will be allowed, and only if
-  // posted by tasks that are not designated as CONTINUE_ON_SHUTDOWN. Once
+  // A variant that allows an arbitrary number of new blocking tasks to be
+  // posted during shutdown. The tasks cannot be posted within the execution
+  // context of tasks whose shutdown behavior is not BLOCKING_SHUTDOWN. Once
   // the limit is reached, subsequent calls to post task fail in all cases.
-  //
   // Must be called from the same thread this object was constructed on.
   void Shutdown(int max_new_blocking_tasks_after_shutdown);