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

webrtc/sdk/android/src/jni/pc/audio_jni.h

Index: webrtc/sdk/android/src/jni/pc/audio_jni.h
diff --git a/webrtc/sdk/android/src/jni/audio_jni.h b/webrtc/sdk/android/src/jni/pc/audio_jni.h
similarity index 85%
rename from webrtc/sdk/android/src/jni/audio_jni.h
rename to webrtc/sdk/android/src/jni/pc/audio_jni.h
index 762d9b8f9b13635a541df1c2062884cb88141177..22cd3ebececc61e3d8aa49cc6299f8def056f3c2 100644
--- a/webrtc/sdk/android/src/jni/audio_jni.h
+++ b/webrtc/sdk/android/src/jni/pc/audio_jni.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_AUDIO_JNI_H_
-#define WEBRTC_SDK_ANDROID_SRC_JNI_AUDIO_JNI_H_
+#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_PC_AUDIO_JNI_H_
+#define WEBRTC_SDK_ANDROID_SRC_JNI_PC_AUDIO_JNI_H_
 
 // Adding 'nogncheck' to disable the gn include headers check.
 // We don't want this target depend on audio related targets
@@ -25,4 +25,4 @@ rtc::scoped_refptr<webrtc::AudioEncoderFactory> CreateAudioEncoderFactory();
 
 }  // namespace webrtc_jni
 
-#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_AUDIO_JNI_H_
+#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_PC_AUDIO_JNI_H_