Add type cast definitions for CPDF_Array.

core/src/fpdfdoc/doc_bookmark.cpp

Index: core/src/fpdfdoc/doc_bookmark.cpp
diff --git a/core/src/fpdfdoc/doc_bookmark.cpp b/core/src/fpdfdoc/doc_bookmark.cpp
index 6b020e5957a3a99dd9c0c4edc1a439c656cd3b68..5ebd27e6e720dfbff40b1201f19c2730dce25f52 100644
--- a/core/src/fpdfdoc/doc_bookmark.cpp
+++ b/core/src/fpdfdoc/doc_bookmark.cpp
@@ -68,21 +68,19 @@ CFX_WideString CPDF_Bookmark::GetTitle() const {
   return CFX_WideString(buf.get(), len);
 }
 CPDF_Dest CPDF_Bookmark::GetDest(CPDF_Document* pDocument) const {
-  if (!m_pDict) {
+  if (!m_pDict)
     return CPDF_Dest();
-  }
+
   CPDF_Object* pDest = m_pDict->GetElementValue("Dest");
   if (!pDest)
     return CPDF_Dest();
-
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDocument, FX_BSTRC("Dests"));
     CFX_ByteStringC name = pDest->GetString();
     return CPDF_Dest(name_tree.LookupNamedDest(pDocument, 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_Bookmark::GetAction() const {