aura: Remove an unnecessary parameter from DispatcherClient::RunWithDispatcher.

ui/views/widget/desktop_aura/desktop_dispatcher_client.cc

Index: ui/views/widget/desktop_aura/desktop_dispatcher_client.cc
diff --git a/ui/views/widget/desktop_aura/desktop_dispatcher_client.cc b/ui/views/widget/desktop_aura/desktop_dispatcher_client.cc
index 212a6a452e3ba1b4478d5e699afedebae50acb13..be251da5c35cf77329f01eca9ebff2fd1f3bb1dd 100644
--- a/ui/views/widget/desktop_aura/desktop_dispatcher_client.cc
+++ b/ui/views/widget/desktop_aura/desktop_dispatcher_client.cc
@@ -14,21 +14,16 @@ DesktopDispatcherClient::~DesktopDispatcherClient() {}
 
 void DesktopDispatcherClient::RunWithDispatcher(
     base::MessagePumpDispatcher* nested_dispatcher,
-    aura::Window* associated_window,
-    bool nestable_tasks_allowed) {
+    aura::Window* associated_window) {
   // TODO(erg): This class has been copypastad from
   // ash/accelerators/nested_dispatcher_controller.cc. I have left my changes
   // commented out because I don't entirely understand the implications of the
   // change.
   base::MessageLoopForUI* loop = base::MessageLoopForUI::current();
-  bool did_allow_task_nesting = loop->NestableTasksAllowed();
-  loop->SetNestableTasksAllowed(nestable_tasks_allowed);
+  base::MessageLoopForUI::ScopedNestableTaskAllower allow_nested(loop);
 
-  // DefaultAcceleratorDispatcher dispatcher(nested_dispatcher,
-  //                                         associated_window);
   base::RunLoop run_loop(nested_dispatcher);
   run_loop.Run();
-  loop->SetNestableTasksAllowed(did_allow_task_nesting);
 }
 
 }  // namespace views