No changes, just move wxComboBox::Clear() out of line in wxGTK.

Make this function non-inline to facilitate further modifications.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/combobox.h

@@ -94,11 +94,7 @@ public:
     virtual void Popup();
     virtual void Dismiss();
 
-    virtual void Clear() wxOVERRIDE
-    {
-        wxTextEntry::Clear();
-        wxItemContainer::Clear();
-    }
+    virtual void Clear() wxOVERRIDE;
 
     // See wxComboBoxBase discussion of IsEmpty().
     bool IsListEmpty() const { return wxItemContainer::IsEmpty(); }