Make CPDF_ColorState have a CFX_ColorStateData rather than inheriting

core/fpdfapi/fpdf_page/cpdf_graphicstates.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/cpdf_graphicstates.h"
 
 CPDF_GraphicStates::CPDF_GraphicStates() {}
 
 CPDF_GraphicStates::~CPDF_GraphicStates() {}
 
 void CPDF_GraphicStates::DefaultStates() {
-  m_ColorState.Emplace()->Default();
+  m_ColorState.Emplace();
+  m_ColorState.SetDefault();
 }
 
 void CPDF_GraphicStates::CopyStates(const CPDF_GraphicStates& src) {
   m_ClipPath = src.m_ClipPath;
   m_GraphState = src.m_GraphState;
   m_ColorState = src.m_ColorState;
   m_TextState = src.m_TextState;
   m_GeneralState = src.m_GeneralState;
 }