Make CPDF_ColorState have a CFX_ColorStateData rather than inheriting

core/fpdfapi/fpdf_page/fpdf_page_parser.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 <memory>
 #include <utility>
@@ skipping 668 matching lines @@
 
 void CPDF_StreamContentParser::Handle_ConcatMatrix() {
   CFX_Matrix new_matrix(GetNumber(5), GetNumber(4), GetNumber(3), GetNumber(2),
                         GetNumber(1), GetNumber(0));
   new_matrix.Concat(m_pCurStates->m_CTM);
   m_pCurStates->m_CTM = new_matrix;
   OnChangeTextMatrix();
 }
 
 void CPDF_StreamContentParser::Handle_SetColorSpace_Fill() {
-  CFX_ByteString csname = GetString(0);
-  CPDF_ColorSpace* pCS = FindColorSpace(csname);
-  if (!pCS) {
+  CPDF_ColorSpace* pCS = FindColorSpace(GetString(0));
+  if (!pCS)
     return;
-  }
-  m_pCurStates->m_ColorState.GetPrivateCopy()->m_FillColor.SetColorSpace(pCS);
+
+  m_pCurStates->m_ColorState.GetMutableFillColor()->SetColorSpace(pCS);
 }
 
 void CPDF_StreamContentParser::Handle_SetColorSpace_Stroke() {
-  CFX_ByteString csname = GetString(0);
-  CPDF_ColorSpace* pCS = FindColorSpace(csname);
-  if (!pCS) {
+  CPDF_ColorSpace* pCS = FindColorSpace(GetString(0));
+  if (!pCS)
     return;
-  }
-  m_pCurStates->m_ColorState.GetPrivateCopy()->m_StrokeColor.SetColorSpace(pCS);
+
+  m_pCurStates->m_ColorState.GetMutableStrokeColor()->SetColorSpace(pCS);
 }
 
 void CPDF_StreamContentParser::Handle_SetDash() {
   CPDF_Array* pArray = ToArray(GetObject(1));
   if (!pArray)
     return;
 
   m_pCurStates->SetLineDash(pArray, GetNumber(0), 1.0f);
 }
 
@@ skipping 969 matching lines @@
         } else {
           PDF_ReplaceAbbr(pElement);
         }
       }
       break;
     }
     default:
       break;
   }
 }