Fix virtual/override/final usage in Source/core/html/.

Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp

Index: Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
diff --git a/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp b/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
index fe6d38a32f17b93cef5af02a19fb003bfcddb817..0370672ff31222dc5e1f20407d38f3ee9bff6118 100644
--- a/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
+++ b/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp
@@ -65,8 +65,8 @@ public:
         , m_hasMinute(false)
         , m_hasSecond(false) { }
 
-    virtual void visitField(DateTimeFormat::FieldType, int) override final;
-    virtual void visitLiteral(const String&) override final { }
+    void visitField(DateTimeFormat::FieldType, int) final;
+    void visitLiteral(const String&) final { }
 
     bool validateFormat(const String& format, const BaseMultipleFieldsDateAndTimeInputType&);