Split off CPDF_Document into its own .cpp/.h files.

xfa/src/fxfa/app/xfa_fontmgr.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 "xfa/src/fxfa/app/xfa_fontmgr.h"
 
 #include <algorithm>
 
+#include "core/include/fpdfapi/cpdf_document.h"
 #include "core/include/fpdfapi/fpdf_resource.h"
 #include "xfa/src/fxfa/app/xfa_ffapp.h"
 #include "xfa/src/fxfa/app/xfa_ffdoc.h"
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 static const XFA_FONTINFO g_XFAFontsMap[] = {
     {0x01d5d33e, L"SimSun", L"Arial", 0, 936},
     {0x01e4f102, L"YouYuan", L"Arial", 1, 936},
     {0x030549dc, L"LiSu", L"Arial", 1, 936},
     {0x032edd44, L"Simhei", L"Arial", 1, 936},
@@ skipping 2057 matching lines @@
     CXFA_PDFFontMgr* pMgr = NULL;
     m_PDFFontMgrArray.GetNextAssoc(ps, (void*&)hDoc, (void*&)pMgr);
     delete pMgr;
   }
   m_PDFFontMgrArray.RemoveAll();
   m_FontMap.clear();
 }
 void CXFA_FontMgr::SetDefFontMgr(IXFA_FontMgr* pFontMgr) {
   m_pDefFontMgr = pFontMgr;
 }