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

fpdfsdk/src/pdfwindow/PWL_FontMap.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 "fpdfsdk/include/pdfwindow/PWL_FontMap.h"
 
+#include "core/include/fpdfapi/cpdf_document.h"
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
 
 namespace {
 
 const char kDefaultFontName[] = "Helvetica";
 
 const char* const g_sDEStandardFontName[] = {"Courier",
                                              "Courier-Bold",
                                              "Courier-BoldOblique",
@@ skipping 470 matching lines @@
 
 CPWL_DocFontMap::CPWL_DocFontMap(IFX_SystemHandler* pSystemHandler,
                                  CPDF_Document* pAttachedDoc)
     : CPWL_FontMap(pSystemHandler), m_pAttachedDoc(pAttachedDoc) {}
 
 CPWL_DocFontMap::~CPWL_DocFontMap() {}
 
 CPDF_Document* CPWL_DocFontMap::GetDocument() {
   return m_pAttachedDoc;
 }