Standardize usage of virtual/override/final in sync/

sync/js/sync_js_controller.h

 // Copyright 2012 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.
 
 #ifndef SYNC_JS_SYNC_JS_CONTROLLER_H_
 #define SYNC_JS_SYNC_JS_CONTROLLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
 class JsBackend;
 
 // A class that mediates between the sync JsEventHandlers and the sync
 // JsBackend.
 class SYNC_EXPORT SyncJsController
     : public JsController, public JsEventHandler,
       public base::SupportsWeakPtr<SyncJsController> {
  public:
   SyncJsController();
 
-  virtual ~SyncJsController();
+  ~SyncJsController() override;
 
   // Sets the backend to route all messages to (if initialized).
   // Sends any queued-up messages if |backend| is initialized.
   void AttachJsBackend(const WeakHandle<JsBackend>& js_backend);
 
   // JsController implementation.
-  virtual void AddJsEventHandler(JsEventHandler* event_handler) override;
-  virtual void RemoveJsEventHandler(JsEventHandler* event_handler) override;
+  void AddJsEventHandler(JsEventHandler* event_handler) override;
+  void RemoveJsEventHandler(JsEventHandler* event_handler) override;
 
   // JsEventHandler implementation.
-  virtual void HandleJsEvent(const std::string& name,
-                             const JsEventDetails& details) override;
+  void HandleJsEvent(const std::string& name,
+                     const JsEventDetails& details) override;
 
  private:
   // Sets |js_backend_|'s event handler depending on how many
   // underlying event handlers we have.
   void UpdateBackendEventHandler();
 
   WeakHandle<JsBackend> js_backend_;
   ObserverList<JsEventHandler> js_event_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncJsController);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_JS_SYNC_JS_CONTROLLER_H_