Replace UnownedPtr with RetainPtr to parser objects in fpdfdoc

Bug: chromium:983867
Change-Id: Ib07bfb48ef85ee7a013f5e1a3d2127648dc950ba
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/57854
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/core/fpdfdoc/cpdf_dest.h b/core/fpdfdoc/cpdf_dest.h
index 4d9bfb8..c1b1df3 100644
--- a/core/fpdfdoc/cpdf_dest.h
+++ b/core/fpdfdoc/cpdf_dest.h
@@ -9,7 +9,7 @@
 
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
-#include "core/fxcrt/unowned_ptr.h"
+#include "core/fxcrt/retain_ptr.h"
 
 class CPDF_Document;
 class CPDF_Array;
@@ -41,7 +41,7 @@
               float* pZoom) const;
 
  private:
-  UnownedPtr<CPDF_Array> const m_pArray;
+  RetainPtr<CPDF_Array> const m_pArray;
 };
 
 #endif  // CORE_FPDFDOC_CPDF_DEST_H_