Add more overrides.

fpdfsdk/include/pdfwindow/PWL_ComboBox.h

Index: fpdfsdk/include/pdfwindow/PWL_ComboBox.h
diff --git a/fpdfsdk/include/pdfwindow/PWL_ComboBox.h b/fpdfsdk/include/pdfwindow/PWL_ComboBox.h
index e29752326c0f7d075c791db5e5cf052b8f4aee38..be0ef0f5e1ecdd5d7c21443365d8a0147367dd8b 100644
--- a/fpdfsdk/include/pdfwindow/PWL_ComboBox.h
+++ b/fpdfsdk/include/pdfwindow/PWL_ComboBox.h
@@ -47,11 +47,11 @@ class CPWL_CBButton : public CPWL_Wnd {
 class CPWL_ComboBox : public CPWL_Wnd {
  public:
   CPWL_ComboBox();
-  ~CPWL_ComboBox() {}
+  ~CPWL_ComboBox() override {}
 
   operator CPWL_Edit*() { return m_pEdit; }
 
-  // CPWL_Wnd
+  // CPWL_Wnd:
   CFX_ByteString GetClassName() const override;
   void OnCreate(PWL_CREATEPARAM& cp) override;
   FX_BOOL OnKeyDown(FX_WORD nChar, FX_DWORD nFlag) override;