More better const-ness in CFX_CountRef<>

core/fpdfapi/fpdf_page/include/cpdf_path.h

 // Copyright 2016 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_FPDFAPI_FPDF_PAGE_INCLUDE_CPDF_PATH_H_
 #define CORE_FPDFAPI_FPDF_PAGE_INCLUDE_CPDF_PATH_H_
 
 #include "core/fxcrt/include/fx_system.h"
@@ skipping 12 matching lines @@
   CFX_FloatRect GetBoundingBox(FX_FLOAT line_width,
                                FX_FLOAT miter_limit) const {
     return GetObject()->GetBoundingBox(line_width, miter_limit);
   }
 
   FX_BOOL IsRect() const { return GetObject()->IsRect(); }
   void Transform(const CFX_Matrix* pMatrix) {
     GetPrivateCopy()->Transform(pMatrix);
   }
   void Append(const CPDF_Path& other, const CFX_Matrix* pMatrix) {
-    GetObject()->Append(other.GetObject(), pMatrix);
+    GetPrivateCopy()->Append(other.GetObject(), pMatrix);
   }
 
   void AppendRect(FX_FLOAT left,
                   FX_FLOAT bottom,
                   FX_FLOAT right,
                   FX_FLOAT top) {
-    GetObject()->AppendRect(left, bottom, right, top);
+    GetPrivateCopy()->AppendRect(left, bottom, right, top);
   }
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PAGE_INCLUDE_CPDF_PATH_H_