5 files changed, 6 insertions, 6 deletions
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_context.h b/fpdfsdk/fpdfxfa/cpdfxfa_context.h
index 9648e8e299..887f06d431 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_context.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_context.h
@@ -33,8 +33,8 @@ enum LoadStatus {
   FXFA_LOADSTATUS_CLOSED
 };
 
-class CPDFXFA_Context : public CPDF_Document::Extension,
-                        public IXFA_AppProvider {
+class CPDFXFA_Context final : public CPDF_Document::Extension,
+                              public IXFA_AppProvider {
  public:
   explicit CPDFXFA_Context(CPDF_Document* pPDFDoc);
   ~CPDFXFA_Context() override;
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h b/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h
index dfc51e03e2..0613fc3bc9 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h
@@ -14,7 +14,7 @@
 
 class CPDFXFA_Context;
 
-class CPDFXFA_DocEnvironment : public IXFA_DocEnvironment {
+class CPDFXFA_DocEnvironment final : public IXFA_DocEnvironment {
  public:
   explicit CPDFXFA_DocEnvironment(CPDFXFA_Context*);
   ~CPDFXFA_DocEnvironment() override;
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_page.h b/fpdfsdk/fpdfxfa/cpdfxfa_page.h
index b660869e68..769bdaa792 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_page.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_page.h
@@ -22,7 +22,7 @@ class CPDF_Dictionary;
 class CPDFXFA_Context;
 class CXFA_FFPageView;
 
-class CPDFXFA_Page : public IPDF_Page {
+class CPDFXFA_Page final : public IPDF_Page {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
diff --git a/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.cpp b/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.cpp
index adba260041..890139498c 100644
--- a/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.cpp
+++ b/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.cpp
@@ -14,7 +14,7 @@
 
 namespace {
 
-class CFWL_FWLAdapterTimerInfo : public CFWL_TimerInfo {
+class CFWL_FWLAdapterTimerInfo final : public CFWL_TimerInfo {
  public:
   CFWL_FWLAdapterTimerInfo(IFWL_AdapterTimerMgr* mgr,
                            int32_t event,
diff --git a/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h b/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h
index 96ccc1ce7e..8bca0bdd28 100644
--- a/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h
+++ b/fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h
@@ -15,7 +15,7 @@
 #include "xfa/fwl/cfwl_timerinfo.h"
 #include "xfa/fwl/ifwl_adaptertimermgr.h"
 
-class CXFA_FWLAdapterTimerMgr : public IFWL_AdapterTimerMgr {
+class CXFA_FWLAdapterTimerMgr final : public IFWL_AdapterTimerMgr {
  public:
   explicit CXFA_FWLAdapterTimerMgr(CPDFSDK_FormFillEnvironment* pFormFillEnv);
   ~CXFA_FWLAdapterTimerMgr() override;