Relanding: Break peerconnection_jni.cc into multiple files, in "pc" directory.

webrtc/sdk/android/src/jni/audio_jni.cc

Index: webrtc/sdk/android/src/jni/audio_jni.cc
diff --git a/webrtc/sdk/android/src/jni/audio_jni.cc b/webrtc/sdk/android/src/jni/audio_jni.cc
deleted file mode 100644
index 58ab73ec65568ec737e623dc36643c8db7b9e32f..0000000000000000000000000000000000000000
--- a/webrtc/sdk/android/src/jni/audio_jni.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
- *  Copyright 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.
- */
-
-#include "webrtc/sdk/android/src/jni/audio_jni.h"
-
-#include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
-#include "webrtc/api/audio_codecs/builtin_audio_encoder_factory.h"
-
-namespace webrtc_jni {
-
-rtc::scoped_refptr<webrtc::AudioDecoderFactory> CreateAudioDecoderFactory() {
-  return webrtc::CreateBuiltinAudioDecoderFactory();
-}
-
-rtc::scoped_refptr<webrtc::AudioEncoderFactory> CreateAudioEncoderFactory() {
-  return webrtc::CreateBuiltinAudioEncoderFactory();
-}
-
-}  // namespace webrtc_jni