Remove RegisterExternal{De,En}coder error codes.

webrtc/modules/video_coding/video_receiver.cc

 /*
  *  Copyright (c) 2013 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 219 matching lines @@
 
 int32_t VideoReceiver::RegisterDecoderTimingCallback(
     VCMDecoderTimingCallback* decoderTiming) {
   CriticalSectionScoped cs(process_crit_sect_.get());
   _decoderTimingCallback = decoderTiming;
   return VCM_OK;
 }
 
 // Register an externally defined decoder/render object.
 // Can be a decoder only or a decoder coupled with a renderer.
-int32_t VideoReceiver::RegisterExternalDecoder(VideoDecoder* externalDecoder,
+void VideoReceiver::RegisterExternalDecoder(VideoDecoder* externalDecoder,
                                                uint8_t payloadType,
                                                bool internalRenderTiming) {
   CriticalSectionScoped cs(_receiveCritSect);
   if (externalDecoder == NULL) {
     // Make sure the VCM updates the decoder next time it decodes.
     _decoder = NULL;
-    return _codecDataBase.DeregisterExternalDecoder(payloadType) ? 0 : -1;
+    RTC_CHECK(_codecDataBase.DeregisterExternalDecoder(payloadType));
   }
-  return _codecDataBase.RegisterExternalDecoder(
-             externalDecoder, payloadType, internalRenderTiming)
-             ? 0
-             : -1;
+  _codecDataBase.RegisterExternalDecoder(externalDecoder, payloadType,
+                                         internalRenderTiming);
 }
 
 // Register a frame type request callback.
 int32_t VideoReceiver::RegisterFrameTypeCallback(
     VCMFrameTypeCallback* frameTypeCallback) {
   CriticalSectionScoped cs(process_crit_sect_.get());
   _frameTypeCallback = frameTypeCallback;
   return VCM_OK;
 }
 
@@ skipping 306 matching lines @@
 }
 
 void VideoReceiver::RegisterPreDecodeImageCallback(
     EncodedImageCallback* observer) {
   CriticalSectionScoped cs(_receiveCritSect);
   pre_decode_image_callback_ = observer;
 }
 
 }  // namespace vcm
 }  // namespace webrtc