Revert of mus: Fix event transformation in client code.

ui/aura/window_event_dispatcher.h

Index: ui/aura/window_event_dispatcher.h
diff --git a/ui/aura/window_event_dispatcher.h b/ui/aura/window_event_dispatcher.h
index 32c0535952b6649cf40aa31bfe201d03a079e500..a0b70604d0117565b7e8e0d6a6b3b09a2b7fdf59 100644
--- a/ui/aura/window_event_dispatcher.h
+++ b/ui/aura/window_event_dispatcher.h
@@ -65,6 +65,8 @@
   explicit WindowEventDispatcher(WindowTreeHost* host);
   ~WindowEventDispatcher() override;
 
+  void set_transform_events(bool value) { transform_events_ = value; }
+
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
   Window* mouse_moved_handler() { return mouse_moved_handler_; }
 
@@ -269,6 +271,8 @@
 
   ScopedObserver<aura::Window, aura::WindowObserver> observer_manager_;
 
+  bool transform_events_;
+
   // Used to schedule reposting an event.
   base::WeakPtrFactory<WindowEventDispatcher> repost_event_factory_;