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

Source/core/html/LinkManifest.h

Index: Source/core/html/LinkManifest.h
diff --git a/Source/core/html/LinkManifest.h b/Source/core/html/LinkManifest.h
index 9fc3db3ad187688c8cae53638acc242af5e52c72..3c612458c3482937229a155800710808e3137347 100644
--- a/Source/core/html/LinkManifest.h
+++ b/Source/core/html/LinkManifest.h
@@ -20,13 +20,13 @@ public:
 
     static PassOwnPtrWillBeRawPtr<LinkManifest> create(HTMLLinkElement* owner);
 
-    virtual ~LinkManifest();
+    ~LinkManifest() override;
 
     // LinkResource
-    virtual void process() override;
-    virtual Type type() const override { return Manifest; }
-    virtual bool hasLoaded() const override;
-    virtual void ownerRemoved() override;
+    void process() override;
+    Type type() const override { return Manifest; }
+    bool hasLoaded() const override;
+    void ownerRemoved() override;
 
 private:
     explicit LinkManifest(HTMLLinkElement* owner);