unused abstract class AbstractSearchProgress

Change-Id: I4bd258b6223b81468195e3d96c1de4a23b7dc293
Reviewed-on: https://gerrit.libreoffice.org/64222
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

include/svx/svxdlg.hxx

@@ -101,12 +101,6 @@ public:
     virtual SfxBindings& GetBindings() = 0;
 };
 
-class AbstractSearchProgress :public VclAbstractRefreshableDialog
-{
-protected:
-    virtual ~AbstractSearchProgress() override = default;
-};
-
 class AbstractTakeProgress :public VclAbstractRefreshableDialog
 {
 protected: