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

Source/core/html/imports/LinkImport.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 35 matching lines @@
 // A LinkResource subclasss used for @rel=import.
 //
 class LinkImport final : public LinkResource, public HTMLImportChildClient {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(LinkImport);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LinkImport);
 public:
 
     static PassOwnPtrWillBeRawPtr<LinkImport> create(HTMLLinkElement* owner);
 
     explicit LinkImport(HTMLLinkElement* owner);
-    virtual ~LinkImport();
+    ~LinkImport() override;
 
     // LinkResource
-    virtual void process() override;
-    virtual Type type() const override { return Import; }
-    virtual bool hasLoaded() const override;
+    void process() override;
+    Type type() const override { return Import; }
+    bool hasLoaded() const override;
     DECLARE_VIRTUAL_TRACE();
-    virtual void ownerInserted() override;
+    void ownerInserted() override;
 
     // HTMLImportChildClient
-    virtual void didFinish() override;
-    virtual void importChildWasDisposed(HTMLImportChild*) override;
-    virtual bool isSync() const override;
-    virtual HTMLLinkElement* link() override;
+    void didFinish() override;
+    void importChildWasDisposed(HTMLImportChild*) override;
+    bool isSync() const override;
+    HTMLLinkElement* link() override;
 
     Document* importedDocument() const;
 
 private:
     RawPtrWillBeMember<HTMLImportChild> m_child;
 };
 
 } // namespace blink
 
 #endif // LinkImport_h