Use smart pointers for class owned pointers in xfa/fxbarcode

xfa/fxbarcode/common/BC_CommonByteArray.h

Index: xfa/fxbarcode/common/BC_CommonByteArray.h
diff --git a/xfa/fxbarcode/common/BC_CommonByteArray.h b/xfa/fxbarcode/common/BC_CommonByteArray.h
index 2570f81c0f64afc34e749668c2088a620fc21c4c..cdda41b4fd0590b6f0610fed0e598e1d60dff2bb 100644
--- a/xfa/fxbarcode/common/BC_CommonByteArray.h
+++ b/xfa/fxbarcode/common/BC_CommonByteArray.h
@@ -9,6 +9,8 @@
 
 #include "core/fxcrt/include/fx_basic.h"
 
+// TODO(weili): The usage of this class should be replaced by
+// std::vector<uint8_t>.
 class CBC_CommonByteArray {
  public:
   CBC_CommonByteArray();
@@ -16,10 +18,10 @@ class CBC_CommonByteArray {
   CBC_CommonByteArray(uint8_t* byteArray, int32_t size);
   virtual ~CBC_CommonByteArray();
 
-  int32_t At(int32_t index);
+  int32_t At(int32_t index) const;
+  int32_t Size() const;
+  FX_BOOL IsEmpty() const;
   void Set(int32_t index, int32_t value);
-  int32_t Size();
-  FX_BOOL IsEmpty();
   void AppendByte(int32_t value);
   void Reserve(int32_t capacity);
   void Set(uint8_t* source, int32_t offset, int32_t count);