Make code compile with clang_use_chrome_plugin (part I)

core/fpdfapi/fpdf_page/include/cpdf_pageobject.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_PAGE_INCLUDE_CPDF_PAGEOBJECT_H_
 #define CORE_FPDFAPI_FPDF_PAGE_INCLUDE_CPDF_PAGEOBJECT_H_
 
 #include "core/fpdfapi/fpdf_page/cpdf_contentmark.h"
@@ skipping 11 matching lines @@
  public:
   enum Type {
     TEXT = 1,
     PATH,
     IMAGE,
     SHADING,
     FORM,
   };
 
   CPDF_PageObject();
-  virtual ~CPDF_PageObject();
+  ~CPDF_PageObject() override;
 
   virtual CPDF_PageObject* Clone() const = 0;
   virtual Type GetType() const = 0;
   virtual void Transform(const CFX_Matrix& matrix) = 0;
-  virtual bool IsText() const { return false; }
-  virtual bool IsPath() const { return false; }
-  virtual bool IsImage() const { return false; }
-  virtual bool IsShading() const { return false; }
-  virtual bool IsForm() const { return false; }
-  virtual CPDF_TextObject* AsText() { return nullptr; }
-  virtual const CPDF_TextObject* AsText() const { return nullptr; }
-  virtual CPDF_PathObject* AsPath() { return nullptr; }
-  virtual const CPDF_PathObject* AsPath() const { return nullptr; }
-  virtual CPDF_ImageObject* AsImage() { return nullptr; }
-  virtual const CPDF_ImageObject* AsImage() const { return nullptr; }
-  virtual CPDF_ShadingObject* AsShading() { return nullptr; }
-  virtual const CPDF_ShadingObject* AsShading() const { return nullptr; }
-  virtual CPDF_FormObject* AsForm() { return nullptr; }
-  virtual const CPDF_FormObject* AsForm() const { return nullptr; }
+  virtual bool IsText() const;
+  virtual bool IsPath() const;
+  virtual bool IsImage() const;
+  virtual bool IsShading() const;
+  virtual bool IsForm() const;
+  virtual CPDF_TextObject* AsText();
+  virtual const CPDF_TextObject* AsText() const;
+  virtual CPDF_PathObject* AsPath();
+  virtual const CPDF_PathObject* AsPath() const;
+  virtual CPDF_ImageObject* AsImage();
+  virtual const CPDF_ImageObject* AsImage() const;
+  virtual CPDF_ShadingObject* AsShading();
+  virtual const CPDF_ShadingObject* AsShading() const;
+  virtual CPDF_FormObject* AsForm();
+  virtual const CPDF_FormObject* AsForm() const;
 
   void TransformClipPath(CFX_Matrix& matrix);
   void TransformGeneralState(CFX_Matrix& matrix);
   FX_RECT GetBBox(const CFX_Matrix* pMatrix) const;
 
   FX_FLOAT m_Left;
   FX_FLOAT m_Right;
   FX_FLOAT m_Top;
   FX_FLOAT m_Bottom;
   CPDF_ContentMark m_ContentMark;
 
  protected:
   void CopyData(const CPDF_PageObject* pSrcObject);
 
  private:
   CPDF_PageObject(const CPDF_PageObject& src) = delete;
   void operator=(const CPDF_PageObject& src) = delete;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PAGE_INCLUDE_CPDF_PAGEOBJECT_H_