loplugin:useuniqueptr in PopupMenuFloatingWindow

Change-Id: If903f677db198978dcf455f06198437a26b6a311
Reviewed-on: https://gerrit.libreoffice.org/53227Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/popupmenuwindow.hxx

@@ -21,12 +21,13 @@
 #define INCLUDED_VCL_POPUPMENUWINDOW_HXX
 
 #include <vcl/floatwin.hxx>
+#include <memory>
 
 class VCL_DLLPUBLIC PopupMenuFloatingWindow : public FloatingWindow
 {
 private:
     struct ImplData;
-    ImplData* mpImplData;
+    std::unique_ptr<ImplData> mpImplData;
 public:
     PopupMenuFloatingWindow( vcl::Window* pParent );
     virtual ~PopupMenuFloatingWindow() override;

vcl/source/window/popupmenuwindow.cxx

@@ -46,7 +46,7 @@ PopupMenuFloatingWindow::~PopupMenuFloatingWindow()
 
 void PopupMenuFloatingWindow::dispose()
 {
-    delete mpImplData;
+    mpImplData.reset();
     FloatingWindow::dispose();
 }