ui: Cleanup class/struct forward declarations

services/ui/ws/server_window_delegate.h

Index: services/ui/ws/server_window_delegate.h
diff --git a/services/ui/ws/server_window_delegate.h b/services/ui/ws/server_window_delegate.h
index e3bf51d06c11bcc2af9c49f4dc57fb90a2704746..affaa616cf53bda3205a66628fe12f6a3bcbf8e6 100644
--- a/services/ui/ws/server_window_delegate.h
+++ b/services/ui/ws/server_window_delegate.h
@@ -24,12 +24,9 @@ class ServerWindowDelegate {
  public:
   virtual DisplayCompositor* GetDisplayCompositor() = 0;
 
-  virtual void OnScheduleWindowPaint(ServerWindow* window) = 0;
-
   // Returns the root of the window tree to which this |window| is attached.
   // Returns null if this window is not attached up through to a root window.
-  virtual const ServerWindow* GetRootWindow(
-      const ServerWindow* window) const = 0;
+  virtual ServerWindow* GetRootWindow(const ServerWindow* window) = 0;
 
  protected:
   virtual ~ServerWindowDelegate() {}