Cleanup FWL Event and Message code.

xfa/fwl/core/cfwl_evttextchanged.cpp

Index: xfa/fwl/core/cfwl_evttextchanged.cpp
diff --git a/xfa/fwl/core/cfwl_evttextchanged.cpp b/xfa/fwl/core/cfwl_evttextchanged.cpp
index 76718be6a2c1cb3e31639c5216bdd75842a78a5d..d21dd037c163a69eab303f062aa5ff3336ab8fee 100644
--- a/xfa/fwl/core/cfwl_evttextchanged.cpp
+++ b/xfa/fwl/core/cfwl_evttextchanged.cpp
@@ -6,10 +6,7 @@
 
 #include "xfa/fwl/core/cfwl_evttextchanged.h"
 
-CFWL_EvtTextChanged::CFWL_EvtTextChanged() {}
+CFWL_EvtTextChanged::CFWL_EvtTextChanged(CFWL_Widget* pSrcTarget)
+    : CFWL_Event(CFWL_Event::Type::TextChanged, pSrcTarget) {}
 
 CFWL_EvtTextChanged::~CFWL_EvtTextChanged() {}
-
-CFWL_EventType CFWL_EvtTextChanged::GetClassID() const {
-  return CFWL_EventType::TextChanged;
-}