Make CPDF_Object containers hold objects via unique pointers

core/fpdfapi/parser/cpdf_dictionary.h

Index: core/fpdfapi/parser/cpdf_dictionary.h
diff --git a/core/fpdfapi/parser/cpdf_dictionary.h b/core/fpdfapi/parser/cpdf_dictionary.h
index fb8200f78c47bfb26528a45b4367d4808f69a4cc..6265522997c0c39d61ee18e3e14047b3d93a5182 100644
--- a/core/fpdfapi/parser/cpdf_dictionary.h
+++ b/core/fpdfapi/parser/cpdf_dictionary.h
@@ -21,8 +21,8 @@ class CPDF_IndirectObjectHolder;
 
 class CPDF_Dictionary : public CPDF_Object {
  public:
-  using iterator = std::map<CFX_ByteString, CPDF_Object*>::iterator;
-  using const_iterator = std::map<CFX_ByteString, CPDF_Object*>::const_iterator;
+  using iterator = std::map<CFX_ByteString, UniqueObject>::iterator;
+  using const_iterator = std::map<CFX_ByteString, UniqueObject>::const_iterator;
 
   CPDF_Dictionary();
   explicit CPDF_Dictionary(const CFX_WeakPtr<CFX_ByteStringPool>& pPool);
@@ -96,7 +96,7 @@ class CPDF_Dictionary : public CPDF_Object {
       std::set<const CPDF_Object*>* visited) const override;
 
   CFX_WeakPtr<CFX_ByteStringPool> m_pPool;
-  std::map<CFX_ByteString, CPDF_Object*> m_Map;
+  std::map<CFX_ByteString, UniqueObject> m_Map;
 };
 
 using UniqueDictionary =