Make CPDF_Dictionary use unique pointers.

core/fpdfapi/parser/cpdf_data_avail.cpp

Index: core/fpdfapi/parser/cpdf_data_avail.cpp
diff --git a/core/fpdfapi/parser/cpdf_data_avail.cpp b/core/fpdfapi/parser/cpdf_data_avail.cpp
index 6af2da6ff0df5319e279d048de45bf881864d2d4..1ac6e06a97ff2e4b55563bcda1e9a2e499304558 100644
--- a/core/fpdfapi/parser/cpdf_data_avail.cpp
+++ b/core/fpdfapi/parser/cpdf_data_avail.cpp
@@ -142,10 +142,8 @@ bool CPDF_DataAvail::AreObjectsAvailable(std::vector<CPDF_Object*>& obj_array,
           continue;
 
         for (const auto& it : *pDict) {
-          const CFX_ByteString& key = it.first;
-          CPDF_Object* value = it.second;
-          if (key != "Parent")
-            new_obj_array.push_back(value);
+          if (it.first != "Parent")
+            new_obj_array.push_back(it.second.get());
         }
       } break;
       case CPDF_Object::REFERENCE: {