Remove RegisterExternal{De,En}coder error codes.

webrtc/modules/video_coding/video_coding_impl.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 64 matching lines @@
   // Get a copy of the currently configured send codec.
   // This method acquires a lock to copy the current configuration out,
   // so it can block and the returned information is not guaranteed to be
   // accurate upon return.  Consider using GetSendCodec() instead and make
   // decisions on that thread with regards to the current codec.
   int32_t SendCodecBlocking(VideoCodec* currentSendCodec) const;
 
   // Same as SendCodecBlocking.  Try to use GetSendCodec() instead.
   VideoCodecType SendCodecBlocking() const;
 
-  int32_t RegisterExternalEncoder(VideoEncoder* externalEncoder,
-                                  uint8_t payloadType,
-                                  bool internalSource);
+  void RegisterExternalEncoder(VideoEncoder* externalEncoder,
+                               uint8_t payloadType,
+                               bool internalSource);
 
   int Bitrate(unsigned int* bitrate) const;
   int FrameRate(unsigned int* framerate) const;
 
   int32_t SetChannelParameters(uint32_t target_bitrate,  // bits/s.
                                uint8_t lossRate,
                                int64_t rtt);
 
   int32_t RegisterTransportCallback(VCMPacketizationCallback* transport);
   int32_t RegisterSendStatisticsCallback(VCMSendStatisticsCallback* sendStats);
@@ skipping 45 matching lines @@
  public:
   typedef VideoCodingModule::ReceiverRobustness ReceiverRobustness;
 
   VideoReceiver(Clock* clock, EventFactory* event_factory);
   ~VideoReceiver();
 
   int32_t RegisterReceiveCodec(const VideoCodec* receiveCodec,
                                int32_t numberOfCores,
                                bool requireKeyFrame);
 
-  int32_t RegisterExternalDecoder(VideoDecoder* externalDecoder,
-                                  uint8_t payloadType,
-                                  bool internalRenderTiming);
+  void RegisterExternalDecoder(VideoDecoder* externalDecoder,
+                               uint8_t payloadType,
+                               bool internalRenderTiming);
   int32_t RegisterReceiveCallback(VCMReceiveCallback* receiveCallback);
   int32_t RegisterReceiveStatisticsCallback(
       VCMReceiveStatisticsCallback* receiveStats);
   int32_t RegisterDecoderTimingCallback(
       VCMDecoderTimingCallback* decoderTiming);
   int32_t RegisterFrameTypeCallback(VCMFrameTypeCallback* frameTypeCallback);
   int32_t RegisterPacketRequestCallback(VCMPacketRequestCallback* callback);
   int RegisterRenderBufferSizeCallback(VCMRenderBufferSizeCallback* callback);
 
   int32_t Decode(uint16_t maxWaitTimeMs);
@@ skipping 62 matching lines @@
   VCMCodecDataBase _codecDataBase GUARDED_BY(_receiveCritSect);
   VCMProcessTimer _receiveStatsTimer;
   VCMProcessTimer _retransmissionTimer;
   VCMProcessTimer _keyRequestTimer;
   QpParser qp_parser_;
 };
 
 }  // namespace vcm
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_VIDEO_CODING_IMPL_H_