WIP: Move the creation of AudioCodecFactory into PeerConnectionFactory.

webrtc/media/base/fakemediaengine.h

Index: webrtc/media/base/fakemediaengine.h
diff --git a/webrtc/media/base/fakemediaengine.h b/webrtc/media/base/fakemediaengine.h
index 1cddda867fdee1ae9981cc626cf510236d6a55e1..6ff5933e4dd5fa8946371a2c80387474116e8863 100644
--- a/webrtc/media/base/fakemediaengine.h
+++ b/webrtc/media/base/fakemediaengine.h
@@ -698,7 +698,9 @@ class FakeBaseEngine {
 
 class FakeVoiceEngine : public FakeBaseEngine {
  public:
-  explicit FakeVoiceEngine(webrtc::AudioDeviceModule* adm)
+  explicit FakeVoiceEngine(
+      webrtc::AudioDeviceModule* adm,
+      std::shared_ptr<webrtc::AudioDecoderFactory> audio_decoder_factory)
       : output_volume_(-1) {
     // Add a fake audio codec. Note that the name must not be "" as there are
     // sanity checks against that.
@@ -811,7 +813,8 @@ class FakeMediaEngine :
     public CompositeMediaEngine<FakeVoiceEngine, FakeVideoEngine> {
  public:
   FakeMediaEngine() :
-      CompositeMediaEngine<FakeVoiceEngine, FakeVideoEngine>(nullptr) {}
+      CompositeMediaEngine<FakeVoiceEngine, FakeVideoEngine>(
+          nullptr, std::shared_ptr<webrtc::AudioDecoderFactory>()) {}
   virtual ~FakeMediaEngine() {}
 
   void SetAudioCodecs(const std::vector<AudioCodec>& codecs) {