Use override in more classes in fpdfsdk/

fpdfsdk/include/javascript/Icon.h

Index: fpdfsdk/include/javascript/Icon.h
diff --git a/fpdfsdk/include/javascript/Icon.h b/fpdfsdk/include/javascript/Icon.h
index 0b549ec61353f84dee3facc504a4ff5cfd4e2bfe..6d2f6e4645dfb32962913adf8d4c57ddef474385 100644
--- a/fpdfsdk/include/javascript/Icon.h
+++ b/fpdfsdk/include/javascript/Icon.h
@@ -12,7 +12,8 @@
 class Icon : public CJS_EmbedObj {
  public:
   Icon(CJS_Object* pJSObject);
-  virtual ~Icon();
+  ~Icon() override;
+
   FX_BOOL name(IFXJS_Context* cc, CJS_PropValue& vp, CFX_WideString& sError);
   void SetStream(CPDF_Stream* pIconStream);
   CPDF_Stream* GetStream();
@@ -26,8 +27,8 @@ class Icon : public CJS_EmbedObj {
 
 class CJS_Icon : public CJS_Object {
  public:
-  CJS_Icon(JSFXObject pObject) : CJS_Object(pObject){};
-  virtual ~CJS_Icon(){};
+  CJS_Icon(JSFXObject pObject) : CJS_Object(pObject) {}
+  ~CJS_Icon() override {}
 
  public:
   DECLARE_JS_CLASS(CJS_Icon);