Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_formproxy.h

Index: xfa/fwl/core/ifwl_formproxy.h
diff --git a/xfa/fwl/core/ifwl_formproxy.h b/xfa/fwl/core/ifwl_formproxy.h
index d5a1bd97de6a79a38683a6036b1f3f4d72ad91db..3bc614c4d42c5871ee8d282d6d0eebef09f4b399 100644
--- a/xfa/fwl/core/ifwl_formproxy.h
+++ b/xfa/fwl/core/ifwl_formproxy.h
@@ -19,11 +19,10 @@ class IFWL_FormProxy : public IFWL_Form {
   ~IFWL_FormProxy() override;
 
   // IFWL_Widget
-  FWL_Error GetClassName(CFX_WideString& wsClass) const override;
   FWL_Type GetClassID() const override;
   FX_BOOL IsInstance(const CFX_WideStringC& wsClass) const override;
   FWL_Error Initialize() override;
-  FWL_Error Finalize() override;
+  void Finalize() override;
   FWL_Error Update() override;
   FWL_Error DrawWidget(CFX_Graphics* pGraphics,
                        const CFX_Matrix* pMatrix = nullptr) override;