Revert "yet another portion of changes towards the binary compatibility"

This reverts commit 618fbf5508.

modules/contrib/include/opencv2/contrib/contrib.hpp

@@ -916,6 +916,9 @@ namespace cv
         // Trains a FaceRecognizer.
         CV_WRAP virtual void train(InputArrayOfArrays src, InputArray labels) = 0;
 
+        // Updates a FaceRecognizer.
+        CV_WRAP virtual void update(InputArrayOfArrays src, InputArray labels);
+
         // Gets a prediction from a FaceRecognizer.
         virtual int predict(InputArray src) const = 0;
 
@@ -933,9 +936,7 @@ namespace cv
 
         // Deserializes this object from a given cv::FileStorage.
         virtual void load(const FileStorage& fs) = 0;
-        
-        // Updates a FaceRecognizer.
-        CV_WRAP virtual void update(InputArrayOfArrays src, InputArray labels);
+
     };
 
     CV_EXPORTS_W Ptr<FaceRecognizer> createEigenFaceRecognizer(int num_components = 0, double threshold = DBL_MAX);