Remove IFWL_CombobBox::DataProvider

xfa/fwl/core/cfwl_combobox.cpp

Index: xfa/fwl/core/cfwl_combobox.cpp
diff --git a/xfa/fwl/core/cfwl_combobox.cpp b/xfa/fwl/core/cfwl_combobox.cpp
index 9af4b8da7df407d929fd9c57844ab0a9e0fec7e2..7eb04b51182ffebf230e38ff0148e955dfbda54c 100644
--- a/xfa/fwl/core/cfwl_combobox.cpp
+++ b/xfa/fwl/core/cfwl_combobox.cpp
@@ -21,8 +21,7 @@ IFWL_ComboBox* ToComboBox(IFWL_Widget* widget) {
 
 }  // namespace
 
-CFWL_ComboBox::CFWL_ComboBox(const CFWL_App* app)
-    : CFWL_Widget(app), m_fMaxListHeight(0) {}
+CFWL_ComboBox::CFWL_ComboBox(const CFWL_App* app) : CFWL_Widget(app) {}
 
 CFWL_ComboBox::~CFWL_ComboBox() {}
 
@@ -49,10 +48,6 @@ void CFWL_ComboBox::RemoveAll() {
     ToComboBox(GetWidget())->RemoveAll();
 }
 
-FX_FLOAT CFWL_ComboBox::GetListHeight(IFWL_Widget* pWidget) {
-  return m_fMaxListHeight;
-}
-
 void CFWL_ComboBox::GetTextByIndex(int32_t iIndex,
                                    CFX_WideString& wsText) const {
   if (!GetWidget())