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

core/src/fpdfdoc/doc_action.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/cpdf_document.h"
 #include "core/include/fpdfdoc/fpdf_doc.h"
 
 CPDF_Dest CPDF_Action::GetDest(CPDF_Document* pDoc) const {
   if (!m_pDict) {
     return CPDF_Dest();
   }
   CFX_ByteString type = m_pDict->GetStringBy("S");
   if (type != "GoTo" && type != "GoToR") {
     return CPDF_Dest();
   }
@@ skipping 265 matching lines @@
   if (!ToDictionary(pAction)) {
     return CPDF_Action();
   }
   return CPDF_Action(pAction->GetDict());
 }
 int CPDF_DocJSActions::FindJSAction(const CFX_ByteString& csName) const {
   ASSERT(m_pDocument);
   CPDF_NameTree name_tree(m_pDocument, "JavaScript");
   return name_tree.GetIndex(csName);
 }