Split fpdfdoc/include/fpdf_doc.h into individual classes.

core/fpdfdoc/include/cpdf_metadata.h

Index: core/fpdfdoc/include/cpdf_metadata.h
diff --git a/core/fpdfdoc/include/cpdf_metadata.h b/core/fpdfdoc/include/cpdf_metadata.h
new file mode 100644
index 0000000000000000000000000000000000000000..31497dd33c9f8a2bedb273b0d39acfff49ca1351
--- /dev/null
+++ b/core/fpdfdoc/include/cpdf_metadata.h
@@ -0,0 +1,26 @@
+// 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
+
+#ifndef CORE_FPDFDOC_INCLUDE_CPDF_METADATA_H_
+#define CORE_FPDFDOC_INCLUDE_CPDF_METADATA_H_
+
+#include <memory>
+
+class CPDF_Document;
+class CXML_Element;
+
+class CPDF_Metadata {
+ public:
+  explicit CPDF_Metadata(CPDF_Document* pDoc);
+  ~CPDF_Metadata();
+
+  const CXML_Element* GetRoot() const;
+
+ private:
+  std::unique_ptr<CXML_Element> m_pXmlElement;
+};
+
+#endif  // CORE_FPDFDOC_INCLUDE_CPDF_METADATA_H_