Revert of Break peerconnection_jni.cc into multiple files, in "pc" directory.

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

+/*
+ *  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.
+ */
+
+#include "webrtc/sdk/android/src/jni/video_jni.h"
+
+namespace webrtc_jni {
+
+cricket::WebRtcVideoEncoderFactory* CreateVideoEncoderFactory(
+    JNIEnv* jni,
+    jobject j_encoder_factory) {
+  return nullptr;
+}
+
+cricket::WebRtcVideoDecoderFactory* CreateVideoDecoderFactory(
+    JNIEnv* jni,
+    jobject j_decoder_factory) {
+  return nullptr;
+}
+
+jobject GetJavaSurfaceTextureHelper(
+    const rtc::scoped_refptr<SurfaceTextureHelper>& surface_texture_helper) {
+  return nullptr;
+}
+
+}  // namespace webrtc_jni