Standardize usage of virtual/override/final in components/

components/signin/core/browser/signin_manager_base.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // The signin manager encapsulates some functionality tracking
 // which user is signed in.
 //
 // **NOTE** on semantics of SigninManager:
 //
 // Once a signin is successful, the username becomes "established" and will not
@@ skipping 43 matching lines @@
 
     // Called when the currently signed-in user for a user has been signed out.
     virtual void GoogleSignedOut(const std::string& account_id,
                                  const std::string& username) {}
 
    protected:
     virtual ~Observer() {}
   };
 
   SigninManagerBase(SigninClient* client);
-  virtual ~SigninManagerBase();
+  ~SigninManagerBase() override;
 
   // If user was signed in, load tokens from DB if available.
   virtual void Initialize(PrefService* local_state);
   bool IsInitialized() const;
 
   // Returns true if a signin to Chrome is allowed (by policy or pref).
   // TODO(tim): kSigninAllowed is defined for all platforms in pref_names.h.
   // If kSigninAllowed pref was non-Chrome OS-only, this method wouldn't be
   // needed, but as is we provide this method to let all interested code
   // code query the value in one way, versus half using PrefService directly
@@ skipping 27 matching lines @@
   // (by platform / depending on StartBehavior). Bug 88109.
   void SetAuthenticatedUsername(const std::string& username);
 
   // Returns true if there is an authenticated user.
   bool IsAuthenticated() const;
 
   // Returns true if there's a signin in progress.
   virtual bool AuthInProgress() const;
 
   // KeyedService implementation.
-  virtual void Shutdown() override;
+  void Shutdown() override;
 
   // Methods to register or remove observers of signin.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Methods to register or remove SigninDiagnosticObservers.
   void AddSigninDiagnosticsObserver(
       signin_internals_util::SigninDiagnosticsObserver* observer);
   void RemoveSigninDiagnosticsObserver(
       signin_internals_util::SigninDiagnosticsObserver* observer);
@@ skipping 30 matching lines @@
   // The list of SigninDiagnosticObservers.
   ObserverList<signin_internals_util::SigninDiagnosticsObserver, true>
       signin_diagnostics_observers_;
 
   base::WeakPtrFactory<SigninManagerBase> weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninManagerBase);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_MANAGER_BASE_H_