ui: Cleanup class/struct forward declarations

services/ui/ws/test_server_window_delegate.h

Index: services/ui/ws/test_server_window_delegate.h
diff --git a/services/ui/ws/test_server_window_delegate.h b/services/ui/ws/test_server_window_delegate.h
index fddc483cf46d3ec9f0b3a8ef2aa3ff0549fb582a..7ab25be34f7307cde5b09928f7a363403d6c96e3 100644
--- a/services/ui/ws/test_server_window_delegate.h
+++ b/services/ui/ws/test_server_window_delegate.h
@@ -19,15 +19,14 @@ class TestServerWindowDelegate : public ServerWindowDelegate {
   TestServerWindowDelegate();
   ~TestServerWindowDelegate() override;
 
-  void set_root_window(const ServerWindow* window) { root_window_ = window; }
+  void set_root_window(ServerWindow* window) { root_window_ = window; }
 
  private:
   // ServerWindowDelegate:
   ui::DisplayCompositor* GetDisplayCompositor() override;
-  void OnScheduleWindowPaint(ServerWindow* window) override;
-  const ServerWindow* GetRootWindow(const ServerWindow* window) const override;
+  ServerWindow* GetRootWindow(const ServerWindow* window) override;
 
-  const ServerWindow* root_window_;
+  ServerWindow* root_window_;
   scoped_refptr<ui::DisplayCompositor> display_compositor_;
 
   DISALLOW_COPY_AND_ASSIGN(TestServerWindowDelegate);