Standardize usage of virtual/override/final in sync/

sync/internal_api/public/events/poll_get_updates_request_event.h

Index: sync/internal_api/public/events/poll_get_updates_request_event.h
diff --git a/sync/internal_api/public/events/poll_get_updates_request_event.h b/sync/internal_api/public/events/poll_get_updates_request_event.h
index 9f7f3933af3e7d7244fecf97e6e1bec27d5a4bb0..3db5247dc118fb11156927d41cf46c9f1e93fa27 100644
--- a/sync/internal_api/public/events/poll_get_updates_request_event.h
+++ b/sync/internal_api/public/events/poll_get_updates_request_event.h
@@ -25,13 +25,13 @@ class SYNC_EXPORT_PRIVATE PollGetUpdatesRequestEvent : public ProtocolEvent {
   PollGetUpdatesRequestEvent(
       base::Time timestamp,
       const sync_pb::ClientToServerMessage& request);
-  virtual ~PollGetUpdatesRequestEvent();
+  ~PollGetUpdatesRequestEvent() override;
 
-  virtual base::Time GetTimestamp() const override;
-  virtual std::string GetType() const override;
-  virtual std::string GetDetails() const override;
-  virtual scoped_ptr<base::DictionaryValue> GetProtoMessage() const override;
-  virtual scoped_ptr<ProtocolEvent> Clone() const override;
+  base::Time GetTimestamp() const override;
+  std::string GetType() const override;
+  std::string GetDetails() const override;
+  scoped_ptr<base::DictionaryValue> GetProtoMessage() const override;
+  scoped_ptr<ProtocolEvent> Clone() const override;
 
  private:
   const base::Time timestamp_;