Decouple editor render runtime factory

editor/app/Windowing/Host/EditorWindowHostInterfaces.h

@@ -26,12 +26,6 @@ struct UIEditorDockHostTabDropTarget;
 
 } // namespace XCEngine::UI::Editor
 
-namespace XCEngine::UI::Editor::Rendering::Host {
-
-class EditorWindowRenderRuntime;
-
-} // namespace XCEngine::UI::Editor::Rendering::Host
-
 namespace XCEngine::UI::Editor::App {
 
 class EditorWindowHostCoordinator;
@@ -100,8 +94,6 @@ class EditorWindowHost {
 public:
     virtual ~EditorWindowHost() = default;
 
-    virtual std::unique_ptr<Rendering::Host::EditorWindowRenderRuntime>
-        CreateWindowRenderRuntime() = 0;
     virtual EditorHostWindow* CreateHostWindow(
         std::unique_ptr<EditorWindowRuntimeController> runtimeController,
         const EditorWindowCreateParams& params) = 0;