Convert FWL_ERR into an enum class.

xfa/fwl/theme/cfwl_formtp.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_THEME_CFWL_FORMTP_H_
 #define XFA_FWL_THEME_CFWL_FORMTP_H_
 
 #include "xfa/fwl/theme/cfwl_utils.h"
 #include "xfa/fwl/theme/cfwl_widgettp.h"
 
 class CFWL_FormTP : public CFWL_WidgetTP {
  public:
   CFWL_FormTP();
   ~CFWL_FormTP() override;
 
-  FWL_ERR Initialize() override;
-  FWL_ERR Finalize() override;
+  FWL_Error Initialize() override;
+  FWL_Error Finalize() override;
   FX_BOOL IsValidWidget(IFWL_Widget* pWidget) override;
   uint32_t SetThemeID(IFWL_Widget* pWidget,
                       uint32_t dwThemeID,
                       FX_BOOL bChildren = TRUE) override;
   FX_BOOL DrawBackground(CFWL_ThemeBackground* pParams) override;
   FX_BOOL DrawText(CFWL_ThemeText* pParams) override;
   void* GetCapacity(CFWL_ThemePart* pThemePart,
                     CFWL_WidgetCapacity dwCapacity) override;
-  FWL_ERR GetPartRect(CFWL_ThemePart* pThemePart, CFX_RectF& rtPart) override;
+  FWL_Error GetPartRect(CFWL_ThemePart* pThemePart, CFX_RectF& rtPart) override;
 
  protected:
   void CalCloseBox(IFWL_Widget* pWidget, CFX_RectF& rect);
   void CalMaxBox(IFWL_Widget* pWidget, CFX_RectF& rect);
   void CalMinBox(IFWL_Widget* pWidget, CFX_RectF& rect);
   void CalCaption(IFWL_Widget* pWidget, CFX_RectF& rect);
   void CalIcon(IFWL_Widget* pWidget, CFX_RectF& rect);
 
   void DrawFormBorder(CFX_Graphics* pGraphics,
                       const CFX_RectF* pRect,
@@ skipping 64 matching lines @@
     FX_ARGB clrBtnEdgeOut[2];
     FX_ARGB clrBtnCornerLight[2][3];
     FX_ARGB clrHeadText[2];
     FX_ARGB clrFormBorder[2][5];
     FX_ARGB clrFormBorderLight[2];
     FX_ARGB clrTransWhite;
   } * m_pThemeData;
 };
 
 #endif  // XFA_FWL_THEME_CFWL_FORMTP_H_