Splitting fpdfdoc/doc_* part I

core/fpdfdoc/doc_metadata.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/fpdfdoc/include/cpdf_metadata.h"
-
-#include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
-#include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h"
-#include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h"
-#include "core/fxcrt/include/fx_xml.h"
-
-CPDF_Metadata::CPDF_Metadata(CPDF_Document* pDoc) {
-  CPDF_Dictionary* pRoot = pDoc->GetRoot();
-  if (!pRoot)
-    return;
-
-  CPDF_Stream* pStream = pRoot->GetStreamBy("Metadata");
-  if (!pStream)
-    return;
-
-  CPDF_StreamAcc acc;
-  acc.LoadAllData(pStream, FALSE);
-  m_pXmlElement.reset(CXML_Element::Parse(acc.GetData(), acc.GetSize()));
-}
-
-CPDF_Metadata::~CPDF_Metadata() {}
-
-const CXML_Element* CPDF_Metadata::GetRoot() const {
-  return m_pXmlElement.get();
-}