Let AudioCodingModule::SendCodec return Maybe<CodecInst>

webrtc/modules/audio_coding/main/test/TestStereo.cc

 /*
  *  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 805 matching lines @@
 void TestStereo::OpenOutFile(int16_t test_number) {
   std::string file_name;
   std::stringstream file_stream;
   file_stream << webrtc::test::OutputPath() << "teststereo_out_" << test_number
       << ".pcm";
   file_name = file_stream.str();
   out_file_.Open(file_name, 32000, "wb");
 }
 
 void TestStereo::DisplaySendReceiveCodec() {
-  CodecInst my_codec_param;
-  acm_a_->SendCodec(&my_codec_param);
+  auto send_codec = acm_a_->SendCodec();
   if (test_mode_ != 0) {
-    printf("%s -> ", my_codec_param.plname);
+    ASSERT_TRUE(send_codec);
+    printf("%s -> ", send_codec->plname);
   }
-  acm_b_->ReceiveCodec(&my_codec_param);
+  CodecInst receive_codec;
+  acm_b_->ReceiveCodec(&receive_codec);
   if (test_mode_ != 0) {
-    printf("%s\n", my_codec_param.plname);
+    printf("%s\n", receive_codec.plname);
   }
 }
 
 }  // namespace webrtc