Remove RegisterExternal{De,En}coder error codes.

webrtc/modules/video_coding/video_receiver_unittest.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 16 matching lines @@
 namespace {
 
 class TestVideoReceiver : public ::testing::Test {
  protected:
   static const int kUnusedPayloadType = 10;
 
   TestVideoReceiver() : clock_(0) {}
 
   virtual void SetUp() {
     receiver_.reset(new VideoReceiver(&clock_, &event_factory_));
-    EXPECT_EQ(0, receiver_->RegisterExternalDecoder(&decoder_,
-                                                    kUnusedPayloadType, true));
+    receiver_->RegisterExternalDecoder(&decoder_, kUnusedPayloadType, true);
     const size_t kMaxNackListSize = 250;
     const int kMaxPacketAgeToNack = 450;
     receiver_->SetNackSettings(kMaxNackListSize, kMaxPacketAgeToNack, 0);
 
     memset(&settings_, 0, sizeof(settings_));
     EXPECT_EQ(0, VideoCodingModule::Codec(kVideoCodecVP8, &settings_));
     settings_.plType = kUnusedPayloadType;  // Use the mocked encoder.
     EXPECT_EQ(0, receiver_->RegisterReceiveCodec(&settings_, 1, true));
   }
 
@@ skipping 153 matching lines @@
 TEST_F(TestVideoReceiver, ReceiverDelay) {
   EXPECT_EQ(0, receiver_->SetMinReceiverDelay(0));
   EXPECT_EQ(0, receiver_->SetMinReceiverDelay(5000));
   EXPECT_EQ(-1, receiver_->SetMinReceiverDelay(-100));
   EXPECT_EQ(-1, receiver_->SetMinReceiverDelay(10010));
 }
 
 }  // namespace
 }  // namespace vcm
 }  // namespace webrtc