Standardize usage of virtual/override/final in sync/

sync/internal_api/js_mutation_event_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_MUTATION_EVENT_OBSERVER_H_
 #define SYNC_INTERNAL_API_JS_MUTATION_EVENT_OBSERVER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
 
 // Observes all change- and transaction-related events and routes a
 // summarized version to a JsEventHandler.
 class SYNC_EXPORT_PRIVATE JsMutationEventObserver
     : public SyncManager::ChangeObserver,
       public syncable::TransactionObserver,
       public base::NonThreadSafe {
  public:
   JsMutationEventObserver();
 
-  virtual ~JsMutationEventObserver();
+  ~JsMutationEventObserver() override;
 
   base::WeakPtr<JsMutationEventObserver> AsWeakPtr();
 
   void InvalidateWeakPtrs();
 
   void SetJsEventHandler(const WeakHandle<JsEventHandler>& event_handler);
 
   // SyncManager::ChangeObserver implementation.
-  virtual void OnChangesApplied(
-      ModelType model_type,
-      int64 write_transaction_id,
-      const ImmutableChangeRecordList& changes) override;
-  virtual void OnChangesComplete(ModelType model_type) override;
+  void OnChangesApplied(ModelType model_type,
+                        int64 write_transaction_id,
+                        const ImmutableChangeRecordList& changes) override;
+  void OnChangesComplete(ModelType model_type) override;
 
   // syncable::TransactionObserver implementation.
-  virtual void OnTransactionWrite(
+  void OnTransactionWrite(
       const syncable::ImmutableWriteTransactionInfo& write_transaction_info,
       ModelTypeSet models_with_changes) override;
 
  private:
   WeakHandle<JsEventHandler> event_handler_;
 
   void HandleJsEvent(
     const tracked_objects::Location& from_here,
     const std::string& name, const JsEventDetails& details);
 
   base::WeakPtrFactory<JsMutationEventObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JsMutationEventObserver);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_JS_MUTATION_EVENT_OBSERVER_H_