Make CPDF_Object containers hold objects via unique pointers

core/fpdfdoc/cpdf_formfield.cpp

Index: core/fpdfdoc/cpdf_formfield.cpp
diff --git a/core/fpdfdoc/cpdf_formfield.cpp b/core/fpdfdoc/cpdf_formfield.cpp
index dc45fbcec7833066ebd9f4ffb4fcc043c129440a..fbe2f052c48721e52379462520ba4885ec36ee77 100644
--- a/core/fpdfdoc/cpdf_formfield.cpp
+++ b/core/fpdfdoc/cpdf_formfield.cpp
@@ -839,7 +839,7 @@ FX_BOOL CPDF_FormField::IsOptionSelected(int iOptIndex) const {
   if (!pArray)
     return FALSE;
 
-  for (CPDF_Object* pObj : *pArray) {
+  for (const auto& pObj : *pArray) {
     if (pObj->GetInteger() == iOptIndex)
       return TRUE;
   }