Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/oned/BC_OnedCode39Writer.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 XFA_FXBARCODE_ONED_BC_ONEDCODE39WRITER_H_
 #define XFA_FXBARCODE_ONED_BC_ONEDCODE39WRITER_H_
 
 #include "xfa/fxbarcode/include/BC_Library.h"
 #include "xfa/fxbarcode/oned/BC_OneDimWriter.h"
 
 class CBC_OnedCode39Writer : public CBC_OneDimWriter {
  public:
   CBC_OnedCode39Writer();
   explicit CBC_OnedCode39Writer(FX_BOOL extendedMode);
-  virtual ~CBC_OnedCode39Writer();
+  ~CBC_OnedCode39Writer() override;
 
+  // CBC_OneDimWriter
   uint8_t* Encode(const CFX_ByteString& contents,
                   BCFORMAT format,
                   int32_t& outWidth,
                   int32_t& outHeight,
-                  int32_t& e);
+                  int32_t& e) override;
   uint8_t* Encode(const CFX_ByteString& contents,
                   BCFORMAT format,
                   int32_t& outWidth,
                   int32_t& outHeight,
                   int32_t hints,
-                  int32_t& e);
+                  int32_t& e) override;
   uint8_t* Encode(const CFX_ByteString& contents,
                   int32_t& outLength,
-                  int32_t& e);
+                  int32_t& e) override;
   void RenderResult(const CFX_WideStringC& contents,
                     uint8_t* code,
                     int32_t codeLength,
                     FX_BOOL isDevice,
-                    int32_t& e);
+                    int32_t& e) override;
+  FX_BOOL CheckContentValidity(const CFX_WideStringC& contents) override;
+  CFX_WideString FilterContents(const CFX_WideStringC& contents) override;
+  CFX_WideString RenderTextContents(const CFX_WideStringC& contents) override;
 
-  CFX_WideString encodedContents(const CFX_WideStringC& contents, int32_t& e);
-  FX_BOOL CheckContentValidity(const CFX_WideStringC& contents);
-  FX_BOOL CheckExtendedContentValidity(const CFX_WideStringC& contents);
-  CFX_WideString FilterContents(const CFX_WideStringC& contents);
-  CFX_WideString FilterExtendedContents(const CFX_WideStringC& contents);
-  CFX_WideString RenderTextContents(const CFX_WideStringC& contents);
-  CFX_WideString RenderExtendedTextContents(const CFX_WideStringC& contents);
-  FX_BOOL SetTextLocation(BC_TEXT_LOC loction);
-  FX_BOOL SetWideNarrowRatio(int32_t ratio);
+  virtual CFX_WideString encodedContents(const CFX_WideStringC& contents,
+                                         int32_t& e);
+  virtual FX_BOOL CheckExtendedContentValidity(const CFX_WideStringC& contents);
+  virtual CFX_WideString FilterExtendedContents(
+      const CFX_WideStringC& contents);
+  virtual CFX_WideString RenderExtendedTextContents(
+      const CFX_WideStringC& contents);
+  virtual FX_BOOL SetTextLocation(BC_TEXT_LOC loction);
+  virtual FX_BOOL SetWideNarrowRatio(int32_t ratio);
 
  private:
   void ToIntArray(int32_t a, int32_t* toReturn);
   FX_CHAR CalcCheckSum(const CFX_ByteString& contents, int32_t& e);
 
   int32_t m_iWideNarrRatio;
   FX_BOOL m_extendedMode;
 };
 
 #endif  // XFA_FXBARCODE_ONED_BC_ONEDCODE39WRITER_H_