Make the I in IFormFiller explicit

fpdfsdk/cpdfsdk_environment.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_environment.h"
 
-#include "fpdfsdk/formfiller/cffl_iformfiller.h"
+#include "fpdfsdk/formfiller/cffl_interactiveformfiller.h"
 #include "fpdfsdk/include/cpdfsdk_annothandlermgr.h"
 #include "fpdfsdk/include/fsdk_actionhandler.h"
 #include "fpdfsdk/javascript/ijs_runtime.h"
 
 #ifdef PDF_ENABLE_XFA
 #include "fpdfsdk/fpdfxfa/include/fpdfxfa_app.h"
 #endif  // PDF_ENABLE_XFA
 
 namespace {
 
@@ skipping 180 matching lines @@
     m_pAnnotHandlerMgr.reset(new CPDFSDK_AnnotHandlerMgr(this));
   return m_pAnnotHandlerMgr.get();
 }
 
 CPDFSDK_ActionHandler* CPDFSDK_Environment::GetActionHander() {
   if (!m_pActionHandler)
     m_pActionHandler.reset(new CPDFSDK_ActionHandler());
   return m_pActionHandler.get();
 }
 
-CFFL_IFormFiller* CPDFSDK_Environment::GetIFormFiller() {
-  if (!m_pIFormFiller)
-    m_pIFormFiller.reset(new CFFL_IFormFiller(this));
-  return m_pIFormFiller.get();
+CFFL_InteractiveFormFiller* CPDFSDK_Environment::GetInteractiveFormFiller() {
+  if (!m_pFormFiller)
+    m_pFormFiller.reset(new CFFL_InteractiveFormFiller(this));
+  return m_pFormFiller.get();
 }