Simplify XFA event handling.

fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/fpdfxfa/include/fpdfxfa_doc.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
@@ skipping 503 matching lines @@
                                           : FXFA_PAGEVIEWEVENT_POSTADDED;
     int count = FXSYS_abs(nNewCount - m_nPageCount);
     m_nPageCount = nNewCount;
     m_XFAPageList.SetSize(nNewCount);
     pEnv->FFI_PageEvent(count, flag);
   }
 }
 
 void CPDFXFA_Document::WidgetEvent(CXFA_FFWidget* hWidget,
                                    CXFA_WidgetAcc* pWidgetData,
-                                   uint32_t dwEvent,
-                                   void* pParam,
-                                   void* pAdditional) {
+                                   uint32_t dwEvent) {
   if (m_iDocType != DOCTYPE_DYNAMIC_XFA || !hWidget)
     return;
 
   CPDFDoc_Environment* pEnv = m_pSDKDoc->GetEnv();
   if (!pEnv)
     return;
 
   CXFA_FFPageView* pPageView = hWidget->GetPageView();
   if (!pPageView)
     return;
@@ skipping 733 matching lines @@
   }
 
   return _GetHValueByName(szPropName, hValue,
                           m_pSDKDoc->GetEnv()->GetJSRuntime());
 }
 FX_BOOL CPDFXFA_Document::_GetHValueByName(const CFX_ByteStringC& utf8Name,
                                            FXJSE_HVALUE hValue,
                                            IJS_Runtime* runTime) {
   return runTime->GetHValueByName(utf8Name, hValue);
 }