Convert FWL_ERR into an enum class.

xfa/fwl/lightwidget/cfwl_theme.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef XFA_FWL_LIGHTWIDGET_CFWL_THEME_H_
 #define XFA_FWL_LIGHTWIDGET_CFWL_THEME_H_
 
 #include <memory>
@@ skipping 13 matching lines @@
  public:
   CFWL_Theme();
   ~CFWL_Theme() override;
 
   // IFWL_ThemeProvider:
   FX_BOOL IsValidWidget(IFWL_Widget* pWidget) override;
   uint32_t GetThemeID(IFWL_Widget* pWidget) override;
   uint32_t SetThemeID(IFWL_Widget* pWidget,
                       uint32_t dwThemeID,
                       FX_BOOL bChildren = TRUE) override;
-  FWL_ERR GetThemeMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) override;
-  FWL_ERR SetThemeMatrix(IFWL_Widget* pWidget,
-                         const CFX_Matrix& matrix) override;
+  FWL_Error GetThemeMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) override;
+  FWL_Error SetThemeMatrix(IFWL_Widget* pWidget,
+                           const CFX_Matrix& matrix) override;
   FX_BOOL DrawBackground(CFWL_ThemeBackground* pParams) override;
   FX_BOOL DrawText(CFWL_ThemeText* pParams) override;
   void* GetCapacity(CFWL_ThemePart* pThemePart,
                     CFWL_WidgetCapacity dwCapacity) override;
   FX_BOOL IsCustomizedLayout(IFWL_Widget* pWidget) override;
-  FWL_ERR GetPartRect(CFWL_ThemePart* pThemePart, CFX_RectF& rtPart) override;
+  FWL_Error GetPartRect(CFWL_ThemePart* pThemePart, CFX_RectF& rtPart) override;
   FX_BOOL IsInPart(CFWL_ThemePart* pThemePart,
                    FX_FLOAT fx,
                    FX_FLOAT fy) override;
   FX_BOOL CalcTextRect(CFWL_ThemeText* pParams, CFX_RectF& rect) override;
 
-  FWL_ERR Initialize();
-  FWL_ERR Finalize();
-  FWL_ERR SetFont(IFWL_Widget* pWidget,
-                  const FX_WCHAR* strFont,
-                  FX_FLOAT fFontSize,
-                  FX_ARGB rgbFont);
+  FWL_Error Initialize();
+  FWL_Error Finalize();
+  FWL_Error SetFont(IFWL_Widget* pWidget,
+                    const FX_WCHAR* strFont,
+                    FX_FLOAT fFontSize,
+                    FX_ARGB rgbFont);
   CFWL_WidgetTP* GetTheme(IFWL_Widget* pWidget);
 
  protected:
   std::vector<std::unique_ptr<CFWL_WidgetTP>> m_ThemesArray;
 };
 
 #endif  // XFA_FWL_LIGHTWIDGET_CFWL_THEME_H_