Standardize usage of virtual/override/final in sync/

sync/internal_api/js_sync_manager_observer.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_INTERNAL_API_JS_SYNC_MANAGER_OBSERVER_H_
 #define SYNC_INTERNAL_API_JS_SYNC_MANAGER_OBSERVER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/sync_manager.h"
 #include "sync/internal_api/public/util/weak_handle.h"
 #include "sync/protocol/sync_protocol_error.h"
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 class JsEventDetails;
 class JsEventHandler;
 
 // Routes SyncManager events to a JsEventHandler.
 class SYNC_EXPORT_PRIVATE JsSyncManagerObserver : public SyncManager::Observer {
  public:
   JsSyncManagerObserver();
-  virtual ~JsSyncManagerObserver();
+  ~JsSyncManagerObserver() override;
 
   void SetJsEventHandler(const WeakHandle<JsEventHandler>& event_handler);
 
   // SyncManager::Observer implementation.
-  virtual void OnSyncCycleCompleted(
+  void OnSyncCycleCompleted(
       const sessions::SyncSessionSnapshot& snapshot) override;
-  virtual void OnConnectionStatusChange(ConnectionStatus status) override;
-  virtual void OnInitializationComplete(
+  void OnConnectionStatusChange(ConnectionStatus status) override;
+  void OnInitializationComplete(
       const WeakHandle<JsBackend>& js_backend,
       const WeakHandle<DataTypeDebugInfoListener>& debug_info_listener,
       bool success,
       syncer::ModelTypeSet restored_types) override;
-  virtual void OnActionableError(
-      const SyncProtocolError& sync_protocol_error) override;
-  virtual void OnProtocolEvent(const ProtocolEvent& event) override;
-  virtual void OnMigrationRequested(
-      syncer::ModelTypeSet types) override;
+  void OnActionableError(const SyncProtocolError& sync_protocol_error) override;
+  void OnProtocolEvent(const ProtocolEvent& event) override;
+  void OnMigrationRequested(syncer::ModelTypeSet types) override;
 
  private:
   void HandleJsEvent(const tracked_objects::Location& from_here,
                     const std::string& name, const JsEventDetails& details);
 
   WeakHandle<JsEventHandler> event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(JsSyncManagerObserver);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_JS_SYNC_MANAGER_OBSERVER_H_