Standardize usage of virtual/override/final in components/

components/dom_distiller/core/distiller_url_fetcher.h

Index: components/dom_distiller/core/distiller_url_fetcher.h
diff --git a/components/dom_distiller/core/distiller_url_fetcher.h b/components/dom_distiller/core/distiller_url_fetcher.h
index 203136d08d626662ffb2b42680dec8dbced4444b..4ed91cd1a49205f70f1fdc0fd259e9ca3d43a3c6 100644
--- a/components/dom_distiller/core/distiller_url_fetcher.h
+++ b/components/dom_distiller/core/distiller_url_fetcher.h
@@ -33,7 +33,7 @@ class DistillerURLFetcherFactory {
 class DistillerURLFetcher : public net::URLFetcherDelegate {
  public:
   explicit DistillerURLFetcher(net::URLRequestContextGetter* context_getter);
-  virtual ~DistillerURLFetcher();
+  ~DistillerURLFetcher() override;
 
   // Indicates when a fetch is done.
   typedef base::Callback<void(const std::string& data)> URLFetcherCallback;
@@ -49,7 +49,7 @@ class DistillerURLFetcher : public net::URLFetcherDelegate {
 
  private:
   // net::URLFetcherDelegate:
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   scoped_ptr<net::URLFetcher> url_fetcher_;
   URLFetcherCallback callback_;