diff --git a/core/fpdfdoc/cpdf_formfield.cpp b/core/fpdfdoc/cpdf_formfield.cpp
index 26c1632..7a7554a 100644
--- a/core/fpdfdoc/cpdf_formfield.cpp
+++ b/core/fpdfdoc/cpdf_formfield.cpp
@@ -289,15 +289,6 @@
                                   static_cast<int>(dwFlags));
 }
 
-ByteString CPDF_FormField::GetDefaultStyle() const {
-  const CPDF_Object* pObj = GetFieldAttr(m_pDict.Get(), "DS");
-  return pObj ? pObj->GetString() : ByteString();
-}
-
-void CPDF_FormField::SetOpt(RetainPtr<CPDF_Object> pOpt) {
-  m_pDict->SetFor("Opt", std::move(pOpt));
-}
-
 WideString CPDF_FormField::GetValue(bool bDefault) const {
   if (GetType() == kCheckBox || GetType() == kRadioButton)
     return GetCheckValue(bDefault);
@@ -535,14 +526,6 @@
   }
 }
 
-bool CPDF_FormField::IsItemDefaultSelected(int index) const {
-  DCHECK(GetType() == kComboBox || GetType() == kListBox);
-  if (index < 0 || index >= CountOptions())
-    return false;
-  int iDVIndex = GetDefaultSelectedItem();
-  return iDVIndex >= 0 && iDVIndex == index;
-}
-
 int CPDF_FormField::GetDefaultSelectedItem() const {
   DCHECK(GetType() == kComboBox || GetType() == kListBox);
   const CPDF_Object* pValue = GetDefaultValueObject();
diff --git a/core/fpdfdoc/cpdf_formfield.h b/core/fpdfdoc/cpdf_formfield.h
index e222dc6..ee4495b 100644
--- a/core/fpdfdoc/cpdf_formfield.h
+++ b/core/fpdfdoc/cpdf_formfield.h
@@ -99,7 +99,6 @@
 
   uint32_t GetFieldFlags() const;
   void SetFieldFlags(uint32_t dwFlags);
-  ByteString GetDefaultStyle() const;
 
   bool IsRequired() const { return m_bRequired; }
   bool IsNoExport() const { return m_bNoExport; }
@@ -116,8 +115,6 @@
   bool IsItemSelected(int index) const;
   bool SetItemSelection(int index, NotificationOption notify);
 
-  bool IsItemDefaultSelected(int index) const;
-
   int GetDefaultSelectedItem() const;
   int CountOptions() const;
   WideString GetOptionLabel(int index) const;
@@ -144,8 +141,6 @@
 
   WideString GetCheckValue(bool bDefault) const;
 
-  void SetOpt(RetainPtr<CPDF_Object> pOpt);
-
  private:
   WideString GetValue(bool bDefault) const;
   bool SetValue(const WideString& value,