Rename CPDFSDK_Environment to CPDFSDK_FormfillEnvironment

fpdfsdk/formfiller/cffl_pushbutton.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_PUSHBUTTON_H_
 #define FPDFSDK_FORMFILLER_CFFL_PUSHBUTTON_H_
 
 #include "fpdfsdk/formfiller/cffl_formfiller.h"
 
 class CFFL_PushButton : public CFFL_Button {
  public:
-  CFFL_PushButton(CPDFSDK_Environment* pApp, CPDFSDK_Annot* pAnnot);
+  CFFL_PushButton(CPDFSDK_FormFillEnvironment* pApp, CPDFSDK_Annot* pAnnot);
   ~CFFL_PushButton() override;
 
   // CFFL_Button
   CPWL_Wnd* NewPDFWindow(const PWL_CREATEPARAM& cp,
                          CPDFSDK_PageView* pPageView) override;
   FX_BOOL OnChar(CPDFSDK_Annot* pAnnot,
                  uint32_t nChar,
                  uint32_t nFlags) override;
   void OnDraw(CPDFSDK_PageView* pPageView,
               CPDFSDK_Annot* pAnnot,
               CFX_RenderDevice* pDevice,
               CFX_Matrix* pUser2Device) override;
 };
 
 #endif  // FPDFSDK_FORMFILLER_CFFL_PUSHBUTTON_H_