Cleanup includes, comments, and unused code

core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.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/include/fpdfapi/fpdf_parser.h"
+
 #include "core/include/fpdfapi/fpdf_serial.h"
 
 CFDF_Document::CFDF_Document() : CPDF_IndirectObjects(NULL) {
   m_pRootDict = NULL;
   m_pFile = NULL;
   m_bOwnFile = FALSE;
 }
 CFDF_Document::~CFDF_Document() {
   if (m_bOwnFile && m_pFile) {
     m_pFile->Release();
@@ skipping 153 matching lines @@
     result += wsFileName[1];
     result += ':';
     result += ChangeSlash(wsFileName.c_str() + 2);
     return result;
   }
   CFX_WideString result;
   result += '\\';
   result += ChangeSlash(wsFileName.c_str());
   return result;
 }