Revert "Use TaskScheduler instead of WorkerPool in x11_hotplug_event_handler.cc."

ui/events/platform/x11/x11_hotplug_event_handler.cc

Index: ui/events/platform/x11/x11_hotplug_event_handler.cc
diff --git a/ui/events/platform/x11/x11_hotplug_event_handler.cc b/ui/events/platform/x11/x11_hotplug_event_handler.cc
index f011c73a6e3d0952de7ed9f616f596773acd6f52..be7bb0911d20c6c3339396ab3d825d17f26f1f8e 100644
--- a/ui/events/platform/x11/x11_hotplug_event_handler.cc
+++ b/ui/events/platform/x11/x11_hotplug_event_handler.cc
@@ -23,8 +23,8 @@
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
-#include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "base/threading/worker_pool.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/events/devices/device_hotplug_event_observer.h"
 #include "ui/events/devices/device_util_linux.h"
@@ -493,14 +493,14 @@ void X11HotplugEventHandler::OnHotplugEvent() {
   callbacks.touchpad_callback = base::Bind(&OnTouchpadDevices);
   callbacks.hotplug_finished_callback = base::Bind(&OnHotplugFinished);
 
-  // Parse the device information asynchronously since this operation may block.
-  // Once the device information is extracted the parsed devices will be
-  // returned via the callbacks.
-  base::PostTaskWithTraits(
+  // Parsing the device information may block, so delegate the operation to a
+  // worker thread. Once the device information is extracted the parsed devices
+  // will be returned via the callbacks.
+  base::WorkerPool::PostTask(
       FROM_HERE,
-      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
-      base::BindOnce(&HandleHotplugEventInWorker, device_infos, display_state,
-                     base::ThreadTaskRunnerHandle::Get(), callbacks));
+      base::Bind(&HandleHotplugEventInWorker, device_infos, display_state,
+                 base::ThreadTaskRunnerHandle::Get(), callbacks),
+      true /* task_is_slow */);
 }
 
 }  // namespace ui