Remove RegisterExternal{De,En}coder error codes.

webrtc/modules/video_coding/codec_database.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 80 matching lines @@
   // Receiver Side
   void ResetReceiver();
 
   // Deregisters an external decoder object specified by |payload_type|.
   bool DeregisterExternalDecoder(uint8_t payload_type);
 
   // Registers an external decoder object to the payload type |payload_type|.
   // |internal_render_timing| is set to true if the |external_decoder| has
   // built in rendering which is able to obey the render timestamps of the
   // encoded frames.
-  bool RegisterExternalDecoder(VideoDecoder* external_decoder,
+  void RegisterExternalDecoder(VideoDecoder* external_decoder,
                                uint8_t payload_type,
                                bool internal_render_timing);
 
   bool DecoderRegistered() const;
 
   bool RegisterReceiveCodec(const VideoCodec* receive_codec,
                             int number_of_cores,
                             bool require_key_frame);
 
   bool DeregisterReceiveCodec(uint8_t payload_type);
@@ skipping 57 matching lines @@
   VCMEncodedFrameCallback* const encoded_frame_callback_;
   rtc::scoped_ptr<VCMGenericEncoder> ptr_encoder_;
   VCMGenericDecoder* ptr_decoder_;
   DecoderMap dec_map_;
   ExternalDecoderMap dec_external_map_;
 };  // VCMCodecDataBase
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODEC_DATABASE_H_