Remove CPDF_Object::Release() in favor of direct delete

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..ff290430c0cef9e6d0f2d36631e93cf2b018c631 100644
--- a/core/fpdfdoc/cpdf_formfield.cpp
+++ b/core/fpdfdoc/cpdf_formfield.cpp
@@ -577,8 +577,7 @@ FX_BOOL CPDF_FormField::SetItemSelection(int index,
           if (pValue->GetUnicodeText() == opt_value)
             m_pDict->RemoveFor("V");
         } else if (pValue->IsArray()) {
-          std::unique_ptr<CPDF_Array, ReleaseDeleter<CPDF_Array>> pArray(
-              new CPDF_Array);
+          std::unique_ptr<CPDF_Array> pArray(new CPDF_Array);
           for (int i = 0; i < CountOptions(); i++) {
             if (i != index && IsItemSelected(i)) {
               opt_value = GetOptionValue(i);