Make VCMEncodedFrameCallback const.

webrtc/modules/video_coding/main/source/generic_encoder.h

Index: webrtc/modules/video_coding/main/source/generic_encoder.h
diff --git a/webrtc/modules/video_coding/main/source/generic_encoder.h b/webrtc/modules/video_coding/main/source/generic_encoder.h
index 25235b6b4677ad2565a9d6583bc2cf565727cd40..079345e61f89ba13240f0a02613801b8d48215fc 100644
--- a/webrtc/modules/video_coding/main/source/generic_encoder.h
+++ b/webrtc/modules/video_coding/main/source/generic_encoder.h
@@ -80,6 +80,7 @@ class VCMGenericEncoder
 public:
     VCMGenericEncoder(VideoEncoder* encoder,
                       VideoEncoderRateObserver* rate_observer,
+                      VCMEncodedFrameCallback* encoded_frame_callback,
                       bool internalSource);
     ~VCMGenericEncoder();
     /**
@@ -116,12 +117,6 @@ public:
     int32_t SetChannelParameters(int32_t packetLoss, int64_t rtt);
     int32_t CodecConfigParameters(uint8_t* buffer, int32_t size);
     /**
-    * Register a transport callback which will be called to deliver the encoded
-    * buffers
-    */
-    int32_t RegisterEncodeCallback(
-        VCMEncodedFrameCallback* VCMencodedFrameCallback);
-    /**
     * Get encoder bit rate
     */
     uint32_t BitRate() const;
@@ -145,7 +140,7 @@ public:
 private:
     VideoEncoder* const encoder_;
     VideoEncoderRateObserver* const rate_observer_;
-    VCMEncodedFrameCallback*  vcm_encoded_frame_callback_;
+    VCMEncodedFrameCallback* const vcm_encoded_frame_callback_;
     uint32_t bit_rate_;
     uint32_t frame_rate_;
     const bool internal_source_;