Clean compiling warnings on Linux

xfa/src/fxbarcode/BC_TwoDimWriter.h

Index: xfa/src/fxbarcode/BC_TwoDimWriter.h
diff --git a/xfa/src/fxbarcode/BC_TwoDimWriter.h b/xfa/src/fxbarcode/BC_TwoDimWriter.h
index 6a9866bd51e8cedc0d46430de29a059f13d0e854..dfbd98099a3dc2465d5b90f3178c52c8992bbb6f 100644
--- a/xfa/src/fxbarcode/BC_TwoDimWriter.h
+++ b/xfa/src/fxbarcode/BC_TwoDimWriter.h
@@ -15,28 +15,6 @@ class CBC_TwoDimWriter : public CBC_Writer {
  public:
   CBC_TwoDimWriter();
   virtual ~CBC_TwoDimWriter();
-  virtual uint8_t* Encode(const CFX_WideString& contents,
-                          int32_t ecLevel,
-                          int32_t& outWidth,
-                          int32_t& outHeight,
-                          int32_t& e) {
-    return nullptr;
-  };
-  virtual uint8_t* Encode(const CFX_ByteString& contents,
-                          BCFORMAT format,
-                          int32_t& outWidth,
-                          int32_t& outHeight,
-                          int32_t hints,
-                          int32_t& e) {
-    return nullptr;
-  };
-  virtual uint8_t* Encode(const CFX_ByteString& contents,
-                          BCFORMAT format,
-                          int32_t& outWidth,
-                          int32_t& outHeight,
-                          int32_t& e) {
-    return nullptr;
-  };
   virtual void RenderResult(uint8_t* code,
                             int32_t codeWidth,
                             int32_t codeHeight,