Remove FWL globals.

xfa/fwl/core/ifwl_checkbox.h

Index: xfa/fwl/core/ifwl_checkbox.h
diff --git a/xfa/fwl/core/ifwl_checkbox.h b/xfa/fwl/core/ifwl_checkbox.h
index cdf1e91ca31d3b0cc9a2561e406cf776e1fc4efc..b290f04839b36110a3ded10d59baf752740588ed 100644
--- a/xfa/fwl/core/ifwl_checkbox.h
+++ b/xfa/fwl/core/ifwl_checkbox.h
@@ -57,13 +57,14 @@ class IFWL_CheckBoxDP : public IFWL_DataProvider {
 
 class IFWL_CheckBox : public IFWL_Widget {
  public:
-  explicit IFWL_CheckBox(const CFWL_WidgetImpProperties& properties);
+  explicit IFWL_CheckBox(const IFWL_App* app,
+                         const CFWL_WidgetImpProperties& properties);
   ~IFWL_CheckBox() override;
 
   // IFWL_Widget
-  FWL_Type GetClassID() const override;
-  FWL_Error Initialize() override;
+  void Initialize() override;
   void Finalize() override;
+  FWL_Type GetClassID() const override;
   FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
   FWL_Error Update() override;
   FWL_Error DrawWidget(CFX_Graphics* pGraphics,