Convert FWL_ERR into an enum class.

xfa/fwl/basewidget/ifwl_listbox.h

Index: xfa/fwl/basewidget/ifwl_listbox.h
diff --git a/xfa/fwl/basewidget/ifwl_listbox.h b/xfa/fwl/basewidget/ifwl_listbox.h
index 87d11a3c56092d288395269bee4bb5d4341ffa47..829b38699df5d0760e4aad27893a7c707b8f2e20 100644
--- a/xfa/fwl/basewidget/ifwl_listbox.h
+++ b/xfa/fwl/basewidget/ifwl_listbox.h
@@ -15,7 +15,6 @@
 #define FWL_CLASS_ListBox L"FWL_LISTBOX"
 #define FWL_CLASSHASH_ListBox 1777358317
 #define FWL_STYLEEXT_LTB_MultiSelection (1L << 0)
-#define FWL_STYLEEXT_LTB_Sort (1L << 1)
 #define FWL_STYLEEXT_LTB_ShowScrollBarAlaways (1L << 2)
 #define FWL_STYLEEXT_LTB_MultiColumn (1L << 3)
 #define FWL_STYLEEXT_LTB_LeftAlign (0L << 4)
@@ -61,36 +60,36 @@ class IFWL_ListBoxDP : public IFWL_DataProvider {
                                FWL_HLISTITEM hItem,
                                int32_t nIndex) = 0;
   virtual uint32_t GetItemStyles(IFWL_Widget* pWidget, FWL_HLISTITEM hItem) = 0;
-  virtual FWL_ERR GetItemText(IFWL_Widget* pWidget,
-                              FWL_HLISTITEM hItem,
-                              CFX_WideString& wsText) = 0;
-  virtual FWL_ERR GetItemRect(IFWL_Widget* pWidget,
-                              FWL_HLISTITEM hItem,
-                              CFX_RectF& rtItem) = 0;
+  virtual FWL_Error GetItemText(IFWL_Widget* pWidget,
+                                FWL_HLISTITEM hItem,
+                                CFX_WideString& wsText) = 0;
+  virtual FWL_Error GetItemRect(IFWL_Widget* pWidget,
+                                FWL_HLISTITEM hItem,
+                                CFX_RectF& rtItem) = 0;
   virtual void* GetItemData(IFWL_Widget* pWidget, FWL_HLISTITEM hItem) = 0;
-  virtual FWL_ERR SetItemStyles(IFWL_Widget* pWidget,
+  virtual FWL_Error SetItemStyles(IFWL_Widget* pWidget,
+                                  FWL_HLISTITEM hItem,
+                                  uint32_t dwStyle) = 0;
+  virtual FWL_Error SetItemText(IFWL_Widget* pWidget,
+                                FWL_HLISTITEM hItem,
+                                const FX_WCHAR* pszText) = 0;
+  virtual FWL_Error SetItemRect(IFWL_Widget* pWidget,
                                 FWL_HLISTITEM hItem,
-                                uint32_t dwStyle) = 0;
-  virtual FWL_ERR SetItemText(IFWL_Widget* pWidget,
-                              FWL_HLISTITEM hItem,
-                              const FX_WCHAR* pszText) = 0;
-  virtual FWL_ERR SetItemRect(IFWL_Widget* pWidget,
-                              FWL_HLISTITEM hItem,
-                              const CFX_RectF& rtItem) = 0;
+                                const CFX_RectF& rtItem) = 0;
   virtual FX_FLOAT GetItemHeight(IFWL_Widget* pWidget) = 0;
   virtual CFX_DIBitmap* GetItemIcon(IFWL_Widget* pWidget,
                                     FWL_HLISTITEM hItem) = 0;
-  virtual FWL_ERR GetItemCheckRect(IFWL_Widget* pWidget,
-                                   FWL_HLISTITEM hItem,
-                                   CFX_RectF& rtCheck) = 0;
-  virtual FWL_ERR SetItemCheckRect(IFWL_Widget* pWidget,
-                                   FWL_HLISTITEM hItem,
-                                   const CFX_RectF& rtCheck) = 0;
+  virtual FWL_Error GetItemCheckRect(IFWL_Widget* pWidget,
+                                     FWL_HLISTITEM hItem,
+                                     CFX_RectF& rtCheck) = 0;
+  virtual FWL_Error SetItemCheckRect(IFWL_Widget* pWidget,
+                                     FWL_HLISTITEM hItem,
+                                     const CFX_RectF& rtCheck) = 0;
   virtual uint32_t GetItemCheckState(IFWL_Widget* pWidget,
                                      FWL_HLISTITEM hItem) = 0;
-  virtual FWL_ERR SetItemCheckState(IFWL_Widget* pWidget,
-                                    FWL_HLISTITEM hItem,
-                                    uint32_t dwCheckState) = 0;
+  virtual FWL_Error SetItemCheckState(IFWL_Widget* pWidget,
+                                      FWL_HLISTITEM hItem,
+                                      uint32_t dwCheckState) = 0;
 };
 
 class IFWL_ListBoxCompare {
@@ -110,10 +109,9 @@ class IFWL_ListBox : public IFWL_Widget {
   int32_t CountSelItems();
   FWL_HLISTITEM GetSelItem(int32_t nIndexSel);
   int32_t GetSelIndex(int32_t nIndex);
-  FWL_ERR SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
-  FWL_ERR GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
-  FWL_ERR GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
-  FWL_ERR* Sort(IFWL_ListBoxCompare* pCom);
+  FWL_Error SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
+  FWL_Error GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
+  FWL_Error GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
 
  protected:
   IFWL_ListBox();