Remove VideoCodingModule::VCMPacketizationCallback

And move encoder name cb to VCMSendStatisticsCallback.

BUG=webrtc:5687

Review-Url: https://codereview.webrtc.org/1900193004
Cr-Commit-Position: refs/heads/master@{#12596}
diff --git a/webrtc/modules/video_coding/video_coding_impl.cc b/webrtc/modules/video_coding/video_coding_impl.cc
index 1128e04..219f668 100644
--- a/webrtc/modules/video_coding/video_coding_impl.cc
+++ b/webrtc/modules/video_coding/video_coding_impl.cc
@@ -82,7 +82,8 @@
         sender_(clock,
                 &post_encode_callback_,
                 encoder_rate_observer,
-                qm_settings_callback),
+                qm_settings_callback,
+                nullptr),
         receiver_(clock,
                   event_factory,
                   pre_decode_image_callback,
@@ -132,16 +133,6 @@
     return sender_.SetChannelParameters(target_bitrate, lossRate, rtt);
   }
 
-  int32_t RegisterTransportCallback(
-      VCMPacketizationCallback* transport) override {
-    return sender_.RegisterTransportCallback(transport);
-  }
-
-  int32_t RegisterSendStatisticsCallback(
-      VCMSendStatisticsCallback* sendStats) override {
-    return sender_.RegisterSendStatisticsCallback(sendStats);
-  }
-
   int32_t RegisterProtectionCallback(
       VCMProtectionCallback* protection) override {
     return sender_.RegisterProtectionCallback(protection);