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

ash/accelerators/nested_dispatcher_controller.h

Index: ash/accelerators/nested_dispatcher_controller.h
diff --git a/ash/accelerators/nested_dispatcher_controller.h b/ash/accelerators/nested_dispatcher_controller.h
index b0c2b9a78c5f955c53b3282892f7c19df30657a9..958cbae26da5a611bdecacb4d89c5466a3f6fa5a 100644
--- a/ash/accelerators/nested_dispatcher_controller.h
+++ b/ash/accelerators/nested_dispatcher_controller.h
@@ -23,8 +23,7 @@ class ASH_EXPORT NestedDispatcherController
   virtual ~NestedDispatcherController();
 
   virtual void RunWithDispatcher(base::MessagePumpDispatcher* dispatcher,
-                                 aura::Window* associated_window,
-                                 bool nestable_tasks_allowed) OVERRIDE;
+                                 aura::Window* associated_window) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NestedDispatcherController);