Fix virtual/override/final usage in the rest of Source/core/.

Source/core/frame/Navigator.h

Index: Source/core/frame/Navigator.h
diff --git a/Source/core/frame/Navigator.h b/Source/core/frame/Navigator.h
index 864b08253670ae1d993a92a730b23fa6ae4df86e..a3129e08782479a9c8bcf058ac449130cc1c4456 100644
--- a/Source/core/frame/Navigator.h
+++ b/Source/core/frame/Navigator.h
@@ -61,13 +61,13 @@ public:
     String vendor() const;
     String vendorSub() const;
 
-    virtual String userAgent() const override;
+    String userAgent() const override;
 
     // Relinquishes the storage lock, if one exists.
     void getStorageUpdates();
 
     // NavigatorLanguage
-    virtual Vector<String> languages() override;
+    Vector<String> languages() override;
 
     DECLARE_VIRTUAL_TRACE();