Remove unused forward declarations from vcl/syswin.hxx

Change-Id: Ide4990afa32ba4cc7851d0e7d3d8d1247eb27b3b
Reviewed-on: https://gerrit.libreoffice.org/50155Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

include/svx/sidebar/AreaTransparencyGradientPopup.hxx

@@ -24,6 +24,7 @@
 #include <vcl/floatwin.hxx>
 #include <vcl/toolbox.hxx>
 
+class VclContainer;
 class XFillFloatTransparenceItem;
 
 namespace svx { namespace sidebar {

include/vcl/syswin.hxx

@@ -28,11 +28,9 @@
 #include <o3tl/typed_flags_set.hxx>
 #include <memory>
 
-class ModalDialog;
 class MenuBar;
 class NotebookBar;
 class TaskPaneList;
-class VclContainer;
 
 #define ICON_LO_DEFAULT                 1
 #define ICON_TEXT_DOCUMENT              2

sc/source/ui/inc/navipi.hxx

@@ -40,6 +40,7 @@ class ScNavigatorControllerItem;
 class ScNavigatorDialogWrapper;
 class ScNavigatorDlg;
 class ScNavigatorSettings;
+class VclContainer;
 
 #define SC_DROPMODE_URL         0
 #define SC_DROPMODE_LINK        1

sw/source/uibase/inc/convert.hxx

@@ -24,6 +24,7 @@
 #include <vcl/edit.hxx>
 #include <sfx2/basedlgs.hxx>
 
+class VclContainer;
 class SwTableAutoFormat;
 class SwView;
 class SwWrtShell;