Convert FWL_ERR into an enum class.

xfa/fwl/core/ifwl_widget.h

Index: xfa/fwl/core/ifwl_widget.h
diff --git a/xfa/fwl/core/ifwl_widget.h b/xfa/fwl/core/ifwl_widget.h
index 62f7155c5d2050a046aa15d37b11d0ea851d152b..0743746c2388790be0815178479e54effe9f3722 100644
--- a/xfa/fwl/core/ifwl_widget.h
+++ b/xfa/fwl/core/ifwl_widget.h
@@ -39,48 +39,50 @@ class IFWL_Widget {
   IFWL_Widget() : m_pImpl(nullptr) {}
   virtual ~IFWL_Widget();
 
-  FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
-  FWL_ERR GetGlobalRect(CFX_RectF& rect);
-  FWL_ERR SetWidgetRect(const CFX_RectF& rect);
-  FWL_ERR GetClientRect(CFX_RectF& rect);
+  FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
+  FWL_Error GetGlobalRect(CFX_RectF& rect);
+  FWL_Error SetWidgetRect(const CFX_RectF& rect);
+  FWL_Error GetClientRect(CFX_RectF& rect);
   IFWL_Widget* GetParent();
-  FWL_ERR SetParent(IFWL_Widget* pParent);
+  FWL_Error SetParent(IFWL_Widget* pParent);
   IFWL_Widget* GetOwner();
-  FWL_ERR SetOwner(IFWL_Widget* pOwner);
+  FWL_Error SetOwner(IFWL_Widget* pOwner);
   IFWL_Widget* GetOuter();
   uint32_t GetStyles();
-  FWL_ERR ModifyStyles(uint32_t dwStylesAdded, uint32_t dwStylesRemoved);
+  FWL_Error ModifyStyles(uint32_t dwStylesAdded, uint32_t dwStylesRemoved);
   uint32_t GetStylesEx();
-  FWL_ERR ModifyStylesEx(uint32_t dwStylesExAdded, uint32_t dwStylesExRemoved);
+  FWL_Error ModifyStylesEx(uint32_t dwStylesExAdded,
+                           uint32_t dwStylesExRemoved);
   uint32_t GetStates();
-  FWL_ERR SetStates(uint32_t dwStates, FX_BOOL bSet = TRUE);
-  FWL_ERR SetPrivateData(void* module_id,
-                         void* pData,
-                         PD_CALLBACK_FREEDATA callback);
+  FWL_Error SetStates(uint32_t dwStates, FX_BOOL bSet = TRUE);
+  FWL_Error SetPrivateData(void* module_id,
+                           void* pData,
+                           PD_CALLBACK_FREEDATA callback);
   void* GetPrivateData(void* module_id);
-  FWL_ERR Update();
-  FWL_ERR LockUpdate();
-  FWL_ERR UnlockUpdate();
+  FWL_Error Update();
+  FWL_Error LockUpdate();
+  FWL_Error UnlockUpdate();
   FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy);
-  FWL_ERR TransformTo(IFWL_Widget* pWidget, FX_FLOAT& fx, FX_FLOAT& fy);
-  FWL_ERR TransformTo(IFWL_Widget* pWidget, CFX_RectF& rt);
-  FWL_ERR GetMatrix(CFX_Matrix& matrix, FX_BOOL bGlobal = FALSE);
-  FWL_ERR SetMatrix(const CFX_Matrix& matrix);
-  FWL_ERR DrawWidget(CFX_Graphics* pGraphics, const CFX_Matrix* pMatrix = NULL);
+  FWL_Error TransformTo(IFWL_Widget* pWidget, FX_FLOAT& fx, FX_FLOAT& fy);
+  FWL_Error TransformTo(IFWL_Widget* pWidget, CFX_RectF& rt);
+  FWL_Error GetMatrix(CFX_Matrix& matrix, FX_BOOL bGlobal = FALSE);
+  FWL_Error SetMatrix(const CFX_Matrix& matrix);
+  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
+                       const CFX_Matrix* pMatrix = NULL);
   IFWL_ThemeProvider* GetThemeProvider();
-  FWL_ERR SetThemeProvider(IFWL_ThemeProvider* pThemeProvider);
-  FWL_ERR SetDataProvider(IFWL_DataProvider* pDataProvider);
+  FWL_Error SetThemeProvider(IFWL_ThemeProvider* pThemeProvider);
+  FWL_Error SetDataProvider(IFWL_DataProvider* pDataProvider);
   IFWL_WidgetDelegate* SetDelegate(IFWL_WidgetDelegate* pDelegate);
   IFWL_App* GetOwnerApp() const;
   CFX_SizeF GetOffsetFromParent(IFWL_Widget* pParent);
 
   // These call into equivalent polymorphic methods of m_pImpl. There
   // should be no need to override these in subclasses.
-  FWL_ERR GetClassName(CFX_WideString& wsClass) const;
+  FWL_Error GetClassName(CFX_WideString& wsClass) const;
   uint32_t GetClassID() const;
   FX_BOOL IsInstance(const CFX_WideStringC& wsClass) const;
-  FWL_ERR Initialize();
-  FWL_ERR Finalize();
+  FWL_Error Initialize();
+  FWL_Error Finalize();
 
   CFWL_WidgetImp* GetImpl() const { return m_pImpl.get(); }