Unify the three CFWL_EventType::SelectChange classes.

xfa/fwl/core/ifwl_combobox.h

Index: xfa/fwl/core/ifwl_combobox.h
diff --git a/xfa/fwl/core/ifwl_combobox.h b/xfa/fwl/core/ifwl_combobox.h
index 612645c10a9700b440ea595e07dc050e0e451e14..8e23d24de0516fc4c9fe7b8d8001123999ea1887 100644
--- a/xfa/fwl/core/ifwl_combobox.h
+++ b/xfa/fwl/core/ifwl_combobox.h
@@ -45,11 +45,6 @@ class IFWL_Widget;
 #define FWL_STYLEEXT_CMB_ListItemIconText (1L << 12)
 #define FWL_STYLEEXT_CMB_ReadOnly (1L << 13)
 
-FWL_EVENT_DEF(CFWL_EvtCmbSelChanged,
-              CFWL_EventType::SelectChanged,
-              CFX_Int32Array iArraySels;
-              bool bLButtonUp;)
-
 class IFWL_ComboBoxDP : public IFWL_ListBoxDP {
  public:
   virtual FX_FLOAT GetListHeight(IFWL_Widget* pWidget) = 0;