Add type cast definitions for CPDF_Array.

core/src/fpdfdoc/doc_link.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 "../../include/fpdfdoc/fpdf_doc.h"
 
 CPDF_LinkList::CPDF_LinkList() {
 }
@@ skipping 63 matching lines @@
 CPDF_Dest CPDF_Link::GetDest(CPDF_Document* pDoc) {
   CPDF_Object* pDest = m_pDict->GetElementValue("Dest");
   if (!pDest)
     return CPDF_Dest();
 
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDoc, FX_BSTRC("Dests"));
     CFX_ByteStringC name = pDest->GetString();
     return CPDF_Dest(name_tree.LookupNamedDest(pDoc, name));
   }
-  if (pDest->GetType() == PDFOBJ_ARRAY) {
-    return CPDF_Dest((CPDF_Array*)pDest);
-  }
+  if (CPDF_Array* pArray = pDest->AsArray())
+    return CPDF_Dest(pArray);
   return CPDF_Dest();
 }
 CPDF_Action CPDF_Link::GetAction() {
   return CPDF_Action(m_pDict->GetDict("A"));
 }