Standardize usage of virtual/override/final in net/

net/http/transport_security_persister.h

Index: net/http/transport_security_persister.h
diff --git a/net/http/transport_security_persister.h b/net/http/transport_security_persister.h
index 5081c38232b298ad7dc023fc830c4eef5a290056..09b32accd12e4e49ad89d2fef173893e7aeac047 100644
--- a/net/http/transport_security_persister.h
+++ b/net/http/transport_security_persister.h
@@ -62,10 +62,10 @@ class NET_EXPORT TransportSecurityPersister
       const base::FilePath& profile_path,
       const scoped_refptr<base::SequencedTaskRunner>& background_runner,
       bool readonly);
-  virtual ~TransportSecurityPersister();
+  ~TransportSecurityPersister() override;
 
   // Called by the TransportSecurityState when it changes its state.
-  virtual void StateIsDirty(TransportSecurityState*) override;
+  void StateIsDirty(TransportSecurityState*) override;
 
   // ImportantFileWriter::DataSerializer:
   //
@@ -97,7 +97,7 @@ class NET_EXPORT TransportSecurityPersister
   // The reason for hashing them is so that the stored state does not
   // trivially reveal a user's browsing history to an attacker reading the
   // serialized state on disk.
-  virtual bool SerializeData(std::string* data) override;
+  bool SerializeData(std::string* data) override;
 
   // Clears any existing non-static entries, and then re-populates
   // |transport_security_state_|.