Replace const-reference with pointer in SendData.

webrtc/video/vie_encoder.h

Index: webrtc/video/vie_encoder.h
diff --git a/webrtc/video/vie_encoder.h b/webrtc/video/vie_encoder.h
index e8254ed25040cc8b40331d067bba0cdbf20206ee..22c778cef7d8e0cc7b6a9e40a5663a840bc8167c 100644
--- a/webrtc/video/vie_encoder.h
+++ b/webrtc/video/vie_encoder.h
@@ -110,7 +110,7 @@ class ViEEncoder : public RtcpIntraFrameObserver,
   // Implements VCMPacketizationCallback.
   int32_t SendData(uint8_t payload_type,
                    const EncodedImage& encoded_image,
-                   const RTPFragmentationHeader& fragmentation_header,
+                   const RTPFragmentationHeader* fragmentation_header,
                    const RTPVideoHeader* rtp_video_hdr) override;
   void OnEncoderImplementationName(const char* implementation_name) override;