Moved creation of AudioDecoderFactory to inside PeerConnectionFactory.

webrtc/media/engine/nullwebrtcvideoengine_unittest.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "webrtc/media/engine/nullwebrtcvideoengine.h"
 #include "webrtc/media/engine/webrtcvoiceengine.h"
 
 namespace cricket {
 
 class WebRtcMediaEngineNullVideo
     : public CompositeMediaEngine<WebRtcVoiceEngine, NullWebRtcVideoEngine> {
  public:
-  WebRtcMediaEngineNullVideo(webrtc::AudioDeviceModule* adm,
-                             WebRtcVideoEncoderFactory* encoder_factory,
-                             WebRtcVideoDecoderFactory* decoder_factory)
-      : CompositeMediaEngine<WebRtcVoiceEngine, NullWebRtcVideoEngine>(adm) {
-    video_.SetExternalDecoderFactory(decoder_factory);
-    video_.SetExternalEncoderFactory(encoder_factory);
+  WebRtcMediaEngineNullVideo(
+      webrtc::AudioDeviceModule* adm,
+      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
+          audio_decoder_factory,
+      WebRtcVideoEncoderFactory* video_encoder_factory,
+      WebRtcVideoDecoderFactory* video_decoder_factory)
+      : CompositeMediaEngine<WebRtcVoiceEngine, NullWebRtcVideoEngine>(
+            adm, audio_decoder_factory) {
+    video_.SetExternalDecoderFactory(video_decoder_factory);
+    video_.SetExternalEncoderFactory(video_encoder_factory);
   }
 };
 
 // Simple test to check if NullWebRtcVideoEngine implements the methods
 // required by CompositeMediaEngine.
 TEST(NullWebRtcVideoEngineTest, CheckInterface) {
-  WebRtcMediaEngineNullVideo engine(nullptr, nullptr, nullptr);
+  WebRtcMediaEngineNullVideo engine(nullptr, nullptr, nullptr, nullptr);
   EXPECT_TRUE(engine.Init());
 }
 
 }  // namespace cricket