Add |final| keyword to CXFA_{Content,View}LayoutItem.

Change-Id: Ief10bb85aa951a11ea31b1268cc1eee25ef2c651
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/71431
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/xfa/fxfa/layout/cxfa_contentlayoutitem.h b/xfa/fxfa/layout/cxfa_contentlayoutitem.h
index 0e297aa..35fa56d 100644
--- a/xfa/fxfa/layout/cxfa_contentlayoutitem.h
+++ b/xfa/fxfa/layout/cxfa_contentlayoutitem.h
@@ -15,7 +15,7 @@
 
 class CXFA_FFWidget;
 
-class CXFA_ContentLayoutItem : public CXFA_LayoutItem {
+class CXFA_ContentLayoutItem final : public CXFA_LayoutItem {
  public:
   CONSTRUCT_VIA_MAKE_RETAIN;
   ~CXFA_ContentLayoutItem() override;
diff --git a/xfa/fxfa/layout/cxfa_viewlayoutitem.h b/xfa/fxfa/layout/cxfa_viewlayoutitem.h
index e181774..0aedcfc 100644
--- a/xfa/fxfa/layout/cxfa_viewlayoutitem.h
+++ b/xfa/fxfa/layout/cxfa_viewlayoutitem.h
@@ -13,7 +13,7 @@
 
 class CXFA_FFPageView;
 
-class CXFA_ViewLayoutItem : public CXFA_LayoutItem {
+class CXFA_ViewLayoutItem final : public CXFA_LayoutItem {
  public:
   CONSTRUCT_VIA_MAKE_RETAIN;
   ~CXFA_ViewLayoutItem() override;