Make the I in IFormFiller explicit

fpdfsdk/cpdfsdk_interform.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/include/cpdfsdk_interform.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 324 matching lines @@
   }
 }
 
 void CPDFSDK_InterForm::UpdateField(CPDF_FormField* pFormField) {
   for (int i = 0, sz = pFormField->CountControls(); i < sz; i++) {
     CPDF_FormControl* pFormCtrl = pFormField->GetControl(i);
     ASSERT(pFormCtrl);
 
     if (CPDFSDK_Widget* pWidget = GetWidget(pFormCtrl, false)) {
       CPDFSDK_Environment* pEnv = m_pDocument->GetEnv();
-      CFFL_IFormFiller* pIFormFiller = pEnv->GetIFormFiller();
       UnderlyingPageType* pPage = pWidget->GetUnderlyingPage();
       CPDFSDK_PageView* pPageView = m_pDocument->GetPageView(pPage, false);
-      FX_RECT rcBBox = pIFormFiller->GetViewBBox(pPageView, pWidget);
+      FX_RECT rcBBox =
+          pEnv->GetInteractiveFormFiller()->GetViewBBox(pPageView, pWidget);
 
       pEnv->Invalidate(pPage, rcBBox.left, rcBBox.top, rcBBox.right,
                        rcBBox.bottom);
     }
   }
 }
 
 FX_BOOL CPDFSDK_InterForm::OnKeyStrokeCommit(CPDF_FormField* pFormField,
                                              const CFX_WideString& csValue) {
   CPDF_AAction aAction = pFormField->GetAdditionalAction();
@@ skipping 360 matching lines @@
   }
 }
 
 FX_COLORREF CPDFSDK_InterForm::GetHighlightColor(int nFieldType) {
   if (nFieldType < 0 || nFieldType > kNumFieldTypes)
     return FXSYS_RGB(255, 255, 255);
   if (nFieldType == 0)
     return m_aHighlightColor[0];
   return m_aHighlightColor[nFieldType - 1];
 }