Merge IFWL and CFWL classes.

xfa/fwl/core/cfwl_formproxy.h

Index: xfa/fwl/core/cfwl_formproxy.h
diff --git a/xfa/fwl/core/cfwl_formproxy.h b/xfa/fwl/core/cfwl_formproxy.h
index 80e0980d0e62cddf45c91a4a48be226217b8ae87..db8323bf6448024e7386cf663a2f118e20a4d71e 100644
--- a/xfa/fwl/core/cfwl_formproxy.h
+++ b/xfa/fwl/core/cfwl_formproxy.h
@@ -17,10 +17,10 @@ class CFWL_FormProxy : public CFWL_Form {
  public:
   CFWL_FormProxy(const CFWL_App* app,
                  std::unique_ptr<CFWL_WidgetProperties> properties,
-                 IFWL_Widget* pOuter);
+                 CFWL_Widget* pOuter);
   ~CFWL_FormProxy() override;
 
-  // IFWL_Widget
+  // CFWL_Widget
   FWL_Type GetClassID() const override;
   bool IsInstance(const CFX_WideStringC& wsClass) const override;
   void Update() override;