Make CPDF_ClipPath have a CPDF_ClipPathData rather than inheriting

core/fpdfapi/fpdf_page/cpdf_shadingobject.cpp

 // 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
 
 #include "core/fpdfapi/fpdf_page/include/cpdf_shadingobject.h"
 
 #include "core/fpdfapi/fpdf_page/cpdf_shadingpattern.h"
 #include "core/fpdfapi/fpdf_page/pageint.h"
@@ skipping 17 matching lines @@
   }
   obj->m_Matrix = m_Matrix;
   return obj;
 }
 
 CPDF_PageObject::Type CPDF_ShadingObject::GetType() const {
   return SHADING;
 }
 
 void CPDF_ShadingObject::Transform(const CFX_Matrix& matrix) {
-  if (m_ClipPath) {
-    m_ClipPath.GetPrivateCopy();
+  if (m_ClipPath)
     m_ClipPath.Transform(matrix);
-  }
+
   m_Matrix.Concat(matrix);
   if (m_ClipPath) {
     CalcBoundingBox();
   } else {
     matrix.TransformRect(m_Left, m_Right, m_Top, m_Bottom);
   }
 }
 
 bool CPDF_ShadingObject::IsShading() const {
   return true;
 }
 
 CPDF_ShadingObject* CPDF_ShadingObject::AsShading() {
   return this;
 }
 
 const CPDF_ShadingObject* CPDF_ShadingObject::AsShading() const {
   return this;
 }
 
 void CPDF_ShadingObject::CalcBoundingBox() {
   if (!m_ClipPath)
     return;
   CFX_FloatRect rect = m_ClipPath.GetClipBox();
   m_Left = rect.left;
   m_Bottom = rect.bottom;
   m_Right = rect.right;
   m_Top = rect.top;
 }