Make the I in IFormFiller explicit

fpdfsdk/formfiller/cffl_interactiveformfiller.h

 // 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
 
-#ifndef FPDFSDK_FORMFILLER_CFFL_IFORMFILLER_H_
-#define FPDFSDK_FORMFILLER_CFFL_IFORMFILLER_H_
+#ifndef FPDFSDK_FORMFILLER_CFFL_INTERACTIVEFORMFILLER_H_
+#define FPDFSDK_FORMFILLER_CFFL_INTERACTIVEFORMFILLER_H_
 
 #include <map>
 #include <memory>
 
 #include "fpdfsdk/include/fsdk_define.h"
 #include "fpdfsdk/pdfwindow/PWL_Edit.h"
 
 class CFFL_FormFiller;
 class CPDFSDK_Environment;
 class CPDFSDK_Annot;
 class CPDFSDK_PageView;
 class CPDFSDK_Widget;
 
-class CFFL_IFormFiller : public IPWL_Filler_Notify {
+class CFFL_InteractiveFormFiller : public IPWL_Filler_Notify {
  public:
-  explicit CFFL_IFormFiller(CPDFSDK_Environment* pEnv);
-  ~CFFL_IFormFiller() override;
+  explicit CFFL_InteractiveFormFiller(CPDFSDK_Environment* pEnv);
+  ~CFFL_InteractiveFormFiller() override;
 
   virtual FX_BOOL Annot_HitTest(CPDFSDK_PageView* pPageView,
                                 CPDFSDK_Annot* pAnnot,
                                 CFX_FloatPoint point);
   virtual FX_RECT GetViewBBox(CPDFSDK_PageView* pPageView,
                               CPDFSDK_Annot* pAnnot);
   virtual void OnDraw(CPDFSDK_PageView* pPageView,
                       CPDFSDK_Annot* pAnnot,
                       CFX_RenderDevice* pDevice,
                       CFX_Matrix* pUser2Device);
@@ skipping 143 matching lines @@
 };
 
 class CFFL_PrivateData {
  public:
   CPDFSDK_Widget* pWidget;
   CPDFSDK_PageView* pPageView;
   int nWidgetAge;
   int nValueAge;
 };
 
-#endif  // FPDFSDK_FORMFILLER_CFFL_IFORMFILLER_H_
+#endif  // FPDFSDK_FORMFILLER_CFFL_INTERACTIVEFORMFILLER_H_