Use override in more classes in core/

core/include/fpdfdoc/fpdf_doc.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 CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_
 #define CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_
 
 #include <map>
@@ skipping 114 matching lines @@
   FX_FLOAT GetParam(int index);
 
  protected:
   CPDF_Object* m_pObj;
 };
 class CPDF_OCContext : public IPDF_OCContext {
  public:
   enum UsageType { View = 0, Design, Print, Export };
 
   CPDF_OCContext(CPDF_Document* pDoc, UsageType eUsageType = View);
-
-  virtual ~CPDF_OCContext();
+  ~CPDF_OCContext() override;
 
   CPDF_Document* GetDocument() const { return m_pDocument; }
 
   UsageType GetUsageType() const { return m_eUsageType; }
 
-  FX_BOOL CheckOCGVisible(const CPDF_Dictionary* pOCGDict);
+  FX_BOOL CheckOCGVisible(const CPDF_Dictionary* pOCGDict) override;
 
   void ResetOCContext();
 
  protected:
   FX_BOOL LoadOCGStateFromConfig(const CFX_ByteStringC& csConfig,
                                  const CPDF_Dictionary* pOCGDict,
                                  FX_BOOL& bValidConfig) const;
 
   FX_BOOL LoadOCGState(const CPDF_Dictionary* pOCGDict) const;
 
@@ skipping 429 matching lines @@
 #define FIELDTYPE_PUSHBUTTON 1
 #define FIELDTYPE_CHECKBOX 2
 #define FIELDTYPE_RADIOBUTTON 3
 #define FIELDTYPE_COMBOBOX 4
 #define FIELDTYPE_LISTBOX 5
 #define FIELDTYPE_TEXTFIELD 6
 #define FIELDTYPE_SIGNATURE 7
 class CPDF_InterForm : public CFX_PrivateData {
  public:
   CPDF_InterForm(CPDF_Document* pDocument, FX_BOOL bUpdateAP);
-
   ~CPDF_InterForm();
 
   static void EnableUpdateAP(FX_BOOL bUpdateAP);
 
   static FX_BOOL UpdatingAPEnabled();
 
   static CFX_ByteString GenerateNewResourceName(const CPDF_Dictionary* pResDict,
                                                 const FX_CHAR* csType,
                                                 int iMinLen = 2,
                                                 const FX_CHAR* csPrefix = "");
@@ skipping 646 matching lines @@
                         FX_FLOAT fc[4],
                         const CFX_ByteStringC& csEntry);
 
   CFX_WideString GetCaption(const CFX_ByteStringC& csEntry);
 
   CPDF_Stream* GetIcon(const CFX_ByteStringC& csEntry);
   friend class CPDF_FormControl;
 };
 
 #endif  // CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_