Make more CPDF_Parser method const.

fpdfsdk/include/fsdk_baseannot.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_INCLUDE_FSDK_BASEANNOT_H_
 #define FPDFSDK_INCLUDE_FSDK_BASEANNOT_H_
 
 #if _FX_OS_ == _FX_ANDROID_
 #include "time.h"
 #else
 #include <ctime>
 #endif
 
 #include "core/include/fpdfdoc/fpdf_doc.h"
 #include "core/include/fxcrt/fx_basic.h"
 #include "fpdfsdk/include/fsdk_define.h"
 #include "fx_systemhandler.h"
 
 class CPDFSDK_PageView;
 class CPDF_Annot;
 class CPDF_Page;
-class CPDF_Rect;
 class CFX_Matrix;
 class CPDF_RenderOptions;
 class CFX_RenderDevice;
 
 #define CFX_IntArray CFX_ArrayTemplate<int>
 
 class CPDFSDK_DateTime {
  public:
   CPDFSDK_DateTime();
   CPDFSDK_DateTime(const CFX_ByteString& dtStr);
@@ skipping 164 matching lines @@
                        const CFX_ByteString& sAPState = "");
 
  protected:
   CPDF_Annot* m_pAnnot;
 
  private:
   FX_BOOL CreateFormFiller();
 };
 
 #endif  // FPDFSDK_INCLUDE_FSDK_BASEANNOT_H_