Make CPDF_ClipPath have a CPDF_ClipPathData rather than inheriting

fpdfsdk/fpdf_transformpage.cpp

 // 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
 
 #include "public/fpdf_transformpage.h"
 
 #include "core/fpdfapi/fpdf_page/include/cpdf_clippath.h"
 #include "core/fpdfapi/fpdf_page/include/cpdf_page.h"
@@ skipping 205 matching lines @@
 }
 
 DLLEXPORT FPDF_CLIPPATH STDCALL FPDF_CreateClipPath(float left,
                                                     float bottom,
                                                     float right,
                                                     float top) {
   CPDF_Path Path;
   Path.AppendRect(left, bottom, right, top);
 
   CPDF_ClipPath* pNewClipPath = new CPDF_ClipPath();
-  pNewClipPath->GetPrivateCopy();
   pNewClipPath->AppendPath(Path, FXFILL_ALTERNATE, FALSE);
   return pNewClipPath;
 }
 
 DLLEXPORT void STDCALL FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath) {
   delete (CPDF_ClipPath*)clipPath;
 }
 
 void OutputPath(CFX_ByteTextBuf& buf, CPDF_Path path) {
   const CFX_PathData* pPathData = path.GetObject();
@@ skipping 89 matching lines @@
       } else if (pDirectObj->IsStream()) {
         pContentArray = new CPDF_Array();
         pContentArray->AddReference(pDoc, pStream->GetObjNum());
         pContentArray->AddReference(pDoc, pDirectObj->GetObjNum());
         pPageDic->SetAtReference("Contents", pDoc,
                                  pDoc->AddIndirectObject(pContentArray));
       }
     }
   }
 }