Delete DefaultAudioProcessingFactory in the Java layer

This removes the DefaultAudioProcessingFactory, PostProcessingFactory and DefaultAudioProcessingFactoryTest classes and leaves the interface AudioProcessingFactory without any default implementation (as the default APM is already created by the PeerConnectionFactory JNI).

Bug: webrtc:8701
Change-Id: I259108afbc5b24cab5161485f45af4236f775c18
Reviewed-on: https://webrtc-review.googlesource.com/37220
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21577}

sdk/android/src/jni/pc/defaultaudioprocessingfactory.cc

@@ -1,35 +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 <memory>
-
-#include "modules/audio_processing/include/audio_processing.h"
-#include "rtc_base/scoped_ref_ptr.h"
-#include "sdk/android/generated_audio_jni/jni/DefaultAudioProcessingFactory_jni.h"
-#include "sdk/android/src/jni/jni_helpers.h"
-
-namespace webrtc {
-namespace jni {
-
-static jlong JNI_DefaultAudioProcessingFactory_CreateAudioProcessing(
-    JNIEnv*,
-    const JavaParamRef<jclass>&,
-    jlong native_post_processor) {
-  std::unique_ptr<CustomProcessing> post_processor(
-      reinterpret_cast<CustomProcessing*>(native_post_processor));
-  rtc::scoped_refptr<AudioProcessing> audio_processing =
-      AudioProcessingBuilder()
-          .SetCapturePostProcessing(std::move(post_processor))
-          .Create();
-  return jlongFromPointer(audio_processing.release());
-}
-
-}  // namespace jni
-}  // namespace webrtc