Convert FWL_ERR into an enum class.

xfa/fwl/lightwidget/cfwl_tooltip.h

Index: xfa/fwl/lightwidget/cfwl_tooltip.h
diff --git a/xfa/fwl/lightwidget/cfwl_tooltip.h b/xfa/fwl/lightwidget/cfwl_tooltip.h
index 817362a41c789678e7e3521c6f1002df925aeda0..74f702849c094d39d1f95c352fc417ba92006081 100644
--- a/xfa/fwl/lightwidget/cfwl_tooltip.h
+++ b/xfa/fwl/lightwidget/cfwl_tooltip.h
@@ -13,28 +13,35 @@
 class CFWL_ToolTip : public CFWL_Widget {
  public:
   static CFWL_ToolTip* Create();
-  FWL_ERR Initialize(const CFWL_WidgetProperties* pProperties = NULL);
-  FWL_ERR GetCaption(CFX_WideString& wsCaption);
-  FWL_ERR SetCaption(const CFX_WideStringC& wsCaption);
+
+  CFWL_ToolTip();
+  virtual ~CFWL_ToolTip();
+
+  FWL_Error Initialize(const CFWL_WidgetProperties* pProperties = nullptr);
+
+  void GetCaption(CFX_WideString& wsCaption);
+  void SetCaption(const CFX_WideStringC& wsCaption);
+
   int32_t GetInitialDelay();
-  int32_t SetInitialDelay(int32_t nDelayTime);
+  void SetInitialDelay(int32_t nDelayTime);
+
   int32_t GetAutoPopDelay();
-  int32_t SetAutoPopDelay(int32_t nDelayTime);
+  void SetAutoPopDelay(int32_t nDelayTime);
+
   CFX_DIBitmap* GetToolTipIcon();
-  FWL_ERR SetToolTipIcon(CFX_DIBitmap* pBitmap);
+  void SetToolTipIcon(CFX_DIBitmap* pBitmap);
   CFX_SizeF GetToolTipIconSize();
-  FWL_ERR SetToolTipIconSize(CFX_SizeF fSize);
-  FWL_ERR SetAnchor(const CFX_RectF& rtAnchor);
-  FWL_ERR Show();
-  FWL_ERR Hide();
-  CFWL_ToolTip();
-  virtual ~CFWL_ToolTip();
+  void SetToolTipIconSize(CFX_SizeF fSize);
+
+  void SetAnchor(const CFX_RectF& rtAnchor);
+  void Show();
+  void Hide();
 
  protected:
   class CFWL_ToolTipDP : public IFWL_ToolTipDP {
    public:
     CFWL_ToolTipDP();
-    FWL_ERR GetCaption(IFWL_Widget* pWidget, CFX_WideString& wsCaption);
+    FWL_Error GetCaption(IFWL_Widget* pWidget, CFX_WideString& wsCaption);
     int32_t GetInitialDelay(IFWL_Widget* pWidget);
     int32_t GetAutoPopDelay(IFWL_Widget* pWidget);
     CFX_DIBitmap* GetToolTipIcon(IFWL_Widget* pWidget);