Revert of Reimplement the builtin audio codec factories using the new stuff in api/

webrtc/modules/audio_coding/codecs/builtin_audio_encoder_factory_internal.h

Index: webrtc/modules/audio_coding/codecs/builtin_audio_encoder_factory_internal.h
diff --git a/webrtc/modules/audio_coding/codecs/builtin_audio_encoder_factory_internal.h b/webrtc/modules/audio_coding/codecs/builtin_audio_encoder_factory_internal.h
new file mode 100644
index 0000000000000000000000000000000000000000..327e6ca4e56458abb492de00f6f876ba55349de8
--- /dev/null
+++ b/webrtc/modules/audio_coding/codecs/builtin_audio_encoder_factory_internal.h
@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_ENCODER_FACTORY_INTERNAL_H_
+#define WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_ENCODER_FACTORY_INTERNAL_H_
+
+#include "webrtc/api/audio_codecs/audio_encoder_factory.h"
+#include "webrtc/rtc_base/scoped_ref_ptr.h"
+
+namespace webrtc {
+
+// Creates a new factory that can create the built-in types of audio encoders.
+// NOTE: This function is still under development and may change without notice.
+rtc::scoped_refptr<AudioEncoderFactory>
+CreateBuiltinAudioEncoderFactoryInternal();
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_ENCODER_FACTORY_INTERNAL_H_