WIP: Move the creation of AudioCodecFactory into PeerConnectionFactory.

webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h

Index: webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h
diff --git a/webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h b/webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h
index 60ae0f6501e35e9390c63f3303587096c323a9aa..326f49c0fe0cdc6c5d497312173792fde94b27bd 100644
--- a/webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h
+++ b/webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h
@@ -21,7 +21,9 @@ namespace webrtc {
 
 class MockDecoderDatabase : public DecoderDatabase {
  public:
-  MockDecoderDatabase() : DecoderDatabase(nullptr) {}
+  MockDecoderDatabase()
+      : DecoderDatabase(std::shared_ptr<AudioDecoderFactory>()) {}
+
   virtual ~MockDecoderDatabase() { Die(); }
   MOCK_METHOD0(Die, void());
   MOCK_CONST_METHOD0(Empty,