Make CPDF_ColorState have a CFX_ColorStateData rather than inheriting

core/fpdfapi/fpdf_page/fpdf_page_parser_old.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 "core/fpdfapi/fpdf_page/pageint.h"
 
 #include <limits.h>
 
@@ skipping 756 matching lines @@
         m_StreamArray[m_CurrentOffset]->LoadAllData(pStreamObj, FALSE);
         m_CurrentOffset++;
       }
     }
     if (m_InternalStage == STAGE_PARSE) {
       if (!m_pParser) {
         m_pParser.reset(new CPDF_StreamContentParser(
             m_pObjectHolder->m_pDocument, m_pObjectHolder->m_pPageResources,
             nullptr, nullptr, m_pObjectHolder, m_pObjectHolder->m_pResources,
             &m_pObjectHolder->m_BBox, nullptr, 0));
-        m_pParser->GetCurStates()->m_ColorState.GetPrivateCopy()->Default();
+        m_pParser->GetCurStates()->m_ColorState.SetDefault();
       }
       if (m_CurrentOffset >= m_Size) {
         m_InternalStage = STAGE_CHECKCLIP;
       } else {
         m_CurrentOffset +=
             m_pParser->Parse(m_pData + m_CurrentOffset,
                              m_Size - m_CurrentOffset, PARSE_STEP_LIMIT);
       }
     }
     if (m_InternalStage == STAGE_CHECKCLIP) {
@@ skipping 30 matching lines @@
       }
       m_Status = Done;
       return;
     }
     steps++;
     if (pPause && pPause->NeedToPauseNow()) {
       break;
     }
   }
 }