Make code compile with clang_use_chrome_plugin (part V)

xfa/fxfa/app/xfa_ffpageview.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 "xfa/fxfa/include/xfa_ffpageview.h"
 
 #include "xfa/fde/fde_render.h"
 #include "xfa/fxfa/app/xfa_ffcheckbutton.h"
@@ skipping 414 matching lines @@
     CXFA_LayoutItem* pLayoutItem) {
   if (CXFA_FFWidget* pWidget = XFA_GetWidgetFromLayoutItem(pLayoutItem)) {
     if (!pWidget->IsLoaded() &&
         (pWidget->GetStatus() & XFA_WidgetStatus_Visible)) {
       pWidget->LoadWidget();
     }
     return pWidget;
   }
   return NULL;
 }
+
+CXFA_TabParam::CXFA_TabParam() : m_pWidget(NULL) {}
+
+CXFA_TabParam::~CXFA_TabParam() {}