Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fpdfdoc/doc_bookmark.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 <memory>
 #include <vector>
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
@@ skipping 62 matching lines @@
 }
 CPDF_Dest CPDF_Bookmark::GetDest(CPDF_Document* pDocument) const {
   if (!m_pDict)
     return CPDF_Dest();
 
   CPDF_Object* pDest = m_pDict->GetDirectObjectBy("Dest");
   if (!pDest)
     return CPDF_Dest();
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDocument, "Dests");
-    CFX_ByteStringC name = pDest->GetString();
-    return CPDF_Dest(name_tree.LookupNamedDest(pDocument, name));
+    return CPDF_Dest(name_tree.LookupNamedDest(
+        pDocument, pDest->GetString().AsByteStringC()));
   }
   if (CPDF_Array* pArray = pDest->AsArray())
     return CPDF_Dest(pArray);
   return CPDF_Dest();
 }
 CPDF_Action CPDF_Bookmark::GetAction() const {
   if (!m_pDict) {
     return CPDF_Action();
   }
   return CPDF_Action(m_pDict->GetDictBy("A"));
 }