Standardize usage of virtual/override/final in sync/

sync/internal_api/public/events/commit_request_event.h

Index: sync/internal_api/public/events/commit_request_event.h
diff --git a/sync/internal_api/public/events/commit_request_event.h b/sync/internal_api/public/events/commit_request_event.h
index e8f7a1c17c9cbe05c57dc46695640f158b937b3d..23f3cd80274a8759b82625bb11c01b90001dc625 100644
--- a/sync/internal_api/public/events/commit_request_event.h
+++ b/sync/internal_api/public/events/commit_request_event.h
@@ -25,13 +25,13 @@ class SYNC_EXPORT_PRIVATE CommitRequestEvent : public ProtocolEvent {
       size_t num_items,
       ModelTypeSet contributing_types,
       const sync_pb::ClientToServerMessage& request);
-  virtual ~CommitRequestEvent();
+  ~CommitRequestEvent() 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;
 
   static scoped_ptr<base::DictionaryValue> ToValue(
       const ProtocolEvent& event);