Remove remaining CPDFSDK_Document references

fpdfsdk/cpdfsdk_xfawidgethandler.cpp

 // Copyright 2016 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/cpdfsdk_xfawidgethandler.h"
 
 #include "core/fpdfdoc/cpdf_interform.h"
 #include "fpdfsdk/cpdfsdk_annot.h"
@@ skipping 21 matching lines @@
   return !!pAnnot->GetXFAWidget();
 }
 
 CPDFSDK_Annot* CPDFSDK_XFAWidgetHandler::NewAnnot(CPDF_Annot* pAnnot,
                                                   CPDFSDK_PageView* pPage) {
   return nullptr;
 }
 
 CPDFSDK_Annot* CPDFSDK_XFAWidgetHandler::NewAnnot(CXFA_FFWidget* pAnnot,
                                                   CPDFSDK_PageView* pPage) {
-  CPDFSDK_Document* pSDKDoc = m_pEnv->GetSDKDocument();
-  CPDFSDK_InterForm* pInterForm = pSDKDoc->GetInterForm();
+  CPDFSDK_InterForm* pInterForm = m_pEnv->GetSDKDocument()->GetInterForm();
   CPDFSDK_XFAWidget* pWidget = new CPDFSDK_XFAWidget(pAnnot, pPage, pInterForm);
   pInterForm->AddXFAMap(pAnnot, pWidget);
   return pWidget;
 }
 
 void CPDFSDK_XFAWidgetHandler::OnDraw(CPDFSDK_PageView* pPageView,
                                       CPDFSDK_Annot* pAnnot,
                                       CFX_RenderDevice* pDevice,
                                       CFX_Matrix* pUser2Device,
                                       bool bDrawAnnots) {
@@ skipping 323 matching lines @@
     dwFWLFlag |= FWL_KEYFLAG_MButton;
   if (dwFlag & FWL_EVENTFLAG_RightButtonDown)
     dwFWLFlag |= FWL_KEYFLAG_RButton;
   if (dwFlag & FWL_EVENTFLAG_ShiftKey)
     dwFWLFlag |= FWL_KEYFLAG_Shift;
   if (dwFlag & FWL_EVENTFLAG_AltKey)
     dwFWLFlag |= FWL_KEYFLAG_Alt;
 
   return dwFWLFlag;
 }