Unify the three CFWL_EventType::SelectChange classes.

xfa/fwl/core/ifwl_datetimepicker.cpp

Index: xfa/fwl/core/ifwl_datetimepicker.cpp
diff --git a/xfa/fwl/core/ifwl_datetimepicker.cpp b/xfa/fwl/core/ifwl_datetimepicker.cpp
index 1e35eee55b5d82db6209a35c12859aa9e58826c9..8d5d6cf442e98fae60465115280eb60a6be1bb76 100644
--- a/xfa/fwl/core/ifwl_datetimepicker.cpp
+++ b/xfa/fwl/core/ifwl_datetimepicker.cpp
@@ -8,6 +8,7 @@
 
 #include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_evteditchanged.h"
+#include "xfa/fwl/core/cfwl_evtselectchanged.h"
 #include "xfa/fwl/core/cfwl_msgmouse.h"
 #include "xfa/fwl/core/cfwl_msgsetfocus.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
@@ -356,7 +357,7 @@ void IFWL_DateTimePicker::ProcessSelChanged(int32_t iYear,
   m_pEdit->Update();
   Repaint(&m_rtClient);
 
-  CFWL_Event_DtpSelectChanged ev;
+  CFWL_EvtSelectChanged ev;
   ev.m_pSrcTarget = this;
   ev.iYear = m_iYear;
   ev.iMonth = m_iMonth;