Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/sdk/android/src/jni/nv12buffer_jni.cc

 /*
  *  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 <jni.h>
 #include <vector>
 
 #include "third_party/libyuv/include/libyuv/convert.h"
 #include "third_party/libyuv/include/libyuv/scale.h"
 
 #include "webrtc/rtc_base/checks.h"
 
-namespace webrtc_jni {
+namespace webrtc {
+namespace jni {
 
 extern "C" JNIEXPORT void JNICALL
 Java_org_webrtc_NV12Buffer_nativeCropAndScale(JNIEnv* jni,
                                               jclass,
                                               jint crop_x,
                                               jint crop_y,
                                               jint crop_width,
                                               jint crop_height,
                                               jint scale_width,
                                               jint scale_height,
@@ skipping 36 matching lines @@
 
   libyuv::SplitUVPlane(src_uv, src_stride_uv, tmp_u, tmp_stride_u, tmp_v,
                        tmp_stride_v, crop_chroma_width, crop_chroma_height);
 
   libyuv::I420Scale(src_y, src_stride_y, tmp_u, tmp_stride_u, tmp_v,
                     tmp_stride_v, crop_width, crop_height, dst_y, dst_stride_y,
                     dst_u, dst_stride_u, dst_v, dst_stride_v, scale_width,
                     scale_height, libyuv::kFilterBox);
 }
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc