Getting rid of SurfaceIdHandler as it is no longer needed.

services/ui/public/cpp/window.h

Index: services/ui/public/cpp/window.h
diff --git a/services/ui/public/cpp/window.h b/services/ui/public/cpp/window.h
index a5e809256926b3945eb31670d15f8fc4a5613367..34592cf4de7dd80c821fd6d4b1a59d49a9028587 100644
--- a/services/ui/public/cpp/window.h
+++ b/services/ui/public/cpp/window.h
@@ -15,7 +15,6 @@
 #include "mojo/public/cpp/bindings/array.h"
 #include "services/service_manager/public/interfaces/interface_provider.mojom.h"
 #include "services/ui/common/types.h"
-#include "services/ui/public/cpp/surface_id_handler.h"
 #include "services/ui/public/cpp/window_compositor_frame_sink.h"
 #include "services/ui/public/interfaces/mus_constants.mojom.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
@@ -29,7 +28,6 @@ class GpuMemoryBufferManager;
 namespace ui {
 
 class InputEventHandler;
-class SurfaceIdHandler;
 class WindowCompositorFrameSinkBinding;
 class WindowObserver;
 class WindowDropTarget;
@@ -169,10 +167,6 @@ class Window {
     input_event_handler_ = input_event_handler;
   }
 
-  void set_surface_id_handler(SurfaceIdHandler* surface_id_handler) {
-    surface_id_handler_ = surface_id_handler;
-  }
-
   // Observation.
   void AddObserver(WindowObserver* observer);
   void RemoveObserver(WindowObserver* observer);
@@ -368,7 +362,6 @@ class Window {
 
   base::ObserverList<WindowObserver> observers_;
   InputEventHandler* input_event_handler_;
-  SurfaceIdHandler* surface_id_handler_;
 
   gfx::Rect bounds_;
   gfx::Insets client_area_;