Merge to XFA: Use override in more classes in fpdfsdk/

fpdfsdk/include/fsdk_define.h

Index: fpdfsdk/include/fsdk_define.h
diff --git a/fpdfsdk/include/fsdk_define.h b/fpdfsdk/include/fsdk_define.h
index f208c05dab22b5e12da650558583c67f1301cd28..405703656075e1ac7446adb4acc72a4dfc31d585 100644
--- a/fpdfsdk/include/fsdk_define.h
+++ b/fpdfsdk/include/fsdk_define.h
@@ -50,16 +50,16 @@ class IFSDK_PAUSE_Adapter;
 class CPDF_CustomAccess final : public IFX_FileRead {
  public:
   CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess);
-  ~CPDF_CustomAccess() {}
+  ~CPDF_CustomAccess() override {}
+
+  // IFX_FileRead
+  FX_FILESIZE GetSize() override { return m_FileAccess.m_FileLen; }
+  void Release() override { delete this; }
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
 
   virtual CFX_ByteString GetFullPath() { return ""; }
-  virtual FX_FILESIZE GetSize() override { return m_FileAccess.m_FileLen; }
   virtual FX_BOOL GetByte(FX_DWORD pos, uint8_t& ch);
   virtual FX_BOOL GetBlock(FX_DWORD pos, uint8_t* pBuf, FX_DWORD size);
-  virtual void Release() override { delete this; }
-  virtual FX_BOOL ReadBlock(void* buffer,
-                            FX_FILESIZE offset,
-                            size_t size) override;
 
   FPDF_FILEACCESS m_FileAccess;
   uint8_t m_Buffer[512];