Standardize usage of virtual/override/final in net/

net/base/sdch_dictionary_fetcher.h

Index: net/base/sdch_dictionary_fetcher.h
diff --git a/net/base/sdch_dictionary_fetcher.h b/net/base/sdch_dictionary_fetcher.h
index 86aaf48165fbb3d8a1a0674b19b9d5562f0ea27f..d74f64341e77803a4ec2aa62316ad69cfd6c2ca0 100644
--- a/net/base/sdch_dictionary_fetcher.h
+++ b/net/base/sdch_dictionary_fetcher.h
@@ -41,15 +41,15 @@ class NET_EXPORT SdchDictionaryFetcher
   // this object.
   SdchDictionaryFetcher(SdchFetcher::Delegate* consumer,
                         URLRequestContext* context);
-  virtual ~SdchDictionaryFetcher();
+  ~SdchDictionaryFetcher() override;
 
   // Implementation of SdchFetcher methods.
-  virtual void Schedule(const GURL& dictionary_url) override;
-  virtual void Cancel() override;
+  void Schedule(const GURL& dictionary_url) override;
+  void Cancel() override;
 
   // Implementation of URLRequest::Delegate methods.
-  virtual void OnResponseStarted(URLRequest* request) override;
-  virtual void OnReadCompleted(URLRequest* request, int bytes_read) override;
+  void OnResponseStarted(URLRequest* request) override;
+  void OnReadCompleted(URLRequest* request, int bytes_read) override;
 
  private:
   enum State {