Make code compile with clang_use_chrome_plugin (part I)

core/fpdfapi/fpdf_edit/include/cpdf_pagecontentgenerator.h

 // 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
 
 #ifndef CORE_FPDFAPI_FPDF_EDIT_INCLUDE_CPDF_PAGECONTENTGENERATOR_H_
 #define CORE_FPDFAPI_FPDF_EDIT_INCLUDE_CPDF_PAGECONTENTGENERATOR_H_
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_system.h"
 
 class CPDF_Object;
 class CPDF_Page;
 class CPDF_PageObject;
 class CPDF_ImageObject;
 
 class CPDF_PageContentGenerator {
  public:
   explicit CPDF_PageContentGenerator(CPDF_Page* pPage);
+  ~CPDF_PageContentGenerator();
 
   FX_BOOL InsertPageObject(CPDF_PageObject* pPageObject);
   void GenerateContent();
   void TransformContent(CFX_Matrix& matrix);
 
  private:
   void ProcessImage(CFX_ByteTextBuf& buf, CPDF_ImageObject* pImageObj);
   void ProcessForm(CFX_ByteTextBuf& buf,
                    const uint8_t* data,
                    uint32_t size,
                    CFX_Matrix& matrix);
   CFX_ByteString RealizeResource(CPDF_Object* pResourceObj,
                                  const CFX_ByteString& bsType);
 
   CPDF_Page* m_pPage;
   CPDF_Document* m_pDocument;
   CFX_ArrayTemplate<CPDF_PageObject*> m_pageObjects;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_EDIT_INCLUDE_CPDF_PAGECONTENTGENERATOR_H_