Convert FWL_ERR into an enum class.

xfa/fwl/lightwidget/cfwl_checkbox.cpp

Index: xfa/fwl/lightwidget/cfwl_checkbox.cpp
diff --git a/xfa/fwl/lightwidget/cfwl_checkbox.cpp b/xfa/fwl/lightwidget/cfwl_checkbox.cpp
index b5e2a87d67a78ca4e4aab50a9dc9e8f9713e187b..a93bc4674aaa7b1a1a2d9440a17765c3fa084aca 100644
--- a/xfa/fwl/lightwidget/cfwl_checkbox.cpp
+++ b/xfa/fwl/lightwidget/cfwl_checkbox.cpp
@@ -14,38 +14,38 @@ CFWL_CheckBox* CFWL_CheckBox::Create() {
   return new CFWL_CheckBox;
 }
 
-FWL_ERR CFWL_CheckBox::Initialize(const CFWL_WidgetProperties* pProperties) {
+FWL_Error CFWL_CheckBox::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (m_pIface)
-    return FWL_ERR_Indefinite;
+    return FWL_Error::Indefinite;
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
   std::unique_ptr<IFWL_CheckBox> pCheckBox(IFWL_CheckBox::Create(
       m_pProperties->MakeWidgetImpProperties(&m_checkboxData), nullptr));
-  FWL_ERR ret = pCheckBox->Initialize();
-  if (ret != FWL_ERR_Succeeded) {
+  FWL_Error ret = pCheckBox->Initialize();
+  if (ret != FWL_Error::Succeeded) {
     return ret;
   }
   m_pIface = pCheckBox.release();
   CFWL_Widget::Initialize();
-  return FWL_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }
 
-FWL_ERR CFWL_CheckBox::SetCaption(const CFX_WideStringC& wsCaption) {
+FWL_Error CFWL_CheckBox::SetCaption(const CFX_WideStringC& wsCaption) {
   m_checkboxData.m_wsCaption = wsCaption;
-  return FWL_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }
 
-FWL_ERR CFWL_CheckBox::SetBoxSize(FX_FLOAT fHeight) {
+FWL_Error CFWL_CheckBox::SetBoxSize(FX_FLOAT fHeight) {
   m_checkboxData.m_fBoxHeight = fHeight;
-  return FWL_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }
 
 int32_t CFWL_CheckBox::GetCheckState() {
   return static_cast<IFWL_CheckBox*>(m_pIface)->GetCheckState();
 }
 
-FWL_ERR CFWL_CheckBox::SetCheckState(int32_t iCheck) {
+FWL_Error CFWL_CheckBox::SetCheckState(int32_t iCheck) {
   return static_cast<IFWL_CheckBox*>(m_pIface)->SetCheckState(iCheck);
 }
 
@@ -56,10 +56,11 @@ CFWL_CheckBox::~CFWL_CheckBox() {}
 CFWL_CheckBox::CFWL_CheckBoxDP::CFWL_CheckBoxDP()
     : m_fBoxHeight(16.0f), m_wsCaption(L"Check box") {}
 
-FWL_ERR CFWL_CheckBox::CFWL_CheckBoxDP::GetCaption(IFWL_Widget* pWidget,
-                                                   CFX_WideString& wsCaption) {
+FWL_Error CFWL_CheckBox::CFWL_CheckBoxDP::GetCaption(
+    IFWL_Widget* pWidget,
+    CFX_WideString& wsCaption) {
   wsCaption = m_wsCaption;
-  return FWL_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }
 
 FX_FLOAT CFWL_CheckBox::CFWL_CheckBoxDP::GetBoxSize(IFWL_Widget* pWidget) {