Rename fpdfsdk/fpdfxfa files to match contents

fpdfsdk/fpdfxfa/fpdfxfa_page.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_FPDFXFA_FPDFXFA_PAGE_H_
-#define FPDFSDK_FPDFXFA_FPDFXFA_PAGE_H_
-
-#include <memory>
-
-#include "core/fxcrt/fx_system.h"
-
-class CFX_Matrix;
-class CPDFXFA_Document;
-class CPDF_Dictionary;
-class CPDF_Page;
-class CXFA_FFPageView;
-
-class CPDFXFA_Page {
- public:
-  CPDFXFA_Page(CPDFXFA_Document* pDoc, int page_index);
-
-  void Retain() { m_iRef++; }
-  void Release() {
-    if (--m_iRef <= 0)
-      delete this;
-  }
-
-  FX_BOOL LoadPage();
-  FX_BOOL LoadPDFPage(CPDF_Dictionary* pageDict);
-  CPDFXFA_Document* GetDocument() const { return m_pDocument; }
-  int GetPageIndex() const { return m_iPageIndex; }
-  CPDF_Page* GetPDFPage() const { return m_pPDFPage.get(); }
-  CXFA_FFPageView* GetXFAPageView() const { return m_pXFAPageView; }
-
-  void SetXFAPageView(CXFA_FFPageView* pPageView) {
-    m_pXFAPageView = pPageView;
-  }
-
-  FX_FLOAT GetPageWidth() const;
-  FX_FLOAT GetPageHeight() const;
-
-  void DeviceToPage(int start_x,
-                    int start_y,
-                    int size_x,
-                    int size_y,
-                    int rotate,
-                    int device_x,
-                    int device_y,
-                    double* page_x,
-                    double* page_y);
-  void PageToDevice(int start_x,
-                    int start_y,
-                    int size_x,
-                    int size_y,
-                    int rotate,
-                    double page_x,
-                    double page_y,
-                    int* device_x,
-                    int* device_y);
-
-  void GetDisplayMatrix(CFX_Matrix& matrix,
-                        int xPos,
-                        int yPos,
-                        int xSize,
-                        int ySize,
-                        int iRotate) const;
-
- protected:
-  // Refcounted class.
-  ~CPDFXFA_Page();
-
-  FX_BOOL LoadPDFPage();
-  FX_BOOL LoadXFAPageView();
-
- private:
-  std::unique_ptr<CPDF_Page> m_pPDFPage;
-  CXFA_FFPageView* m_pXFAPageView;
-  CPDFXFA_Document* const m_pDocument;
-  const int m_iPageIndex;
-  int m_iRef;
-};
-
-#endif  // FPDFSDK_FPDFXFA_FPDFXFA_PAGE_H_