Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/sdk/android/src/jni/videoframe_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 "libyuv/scale.h"
 
 #include "webrtc/rtc_base/checks.h"
 
-namespace webrtc_jni {
+namespace webrtc {
+namespace jni {
 
 extern "C" JNIEXPORT void JNICALL
 Java_org_webrtc_VideoFrame_nativeCropAndScaleI420(JNIEnv* jni,
                                                   jclass,
                                                   jobject j_src_y,
                                                   jint src_stride_y,
                                                   jobject j_src_u,
                                                   jint src_stride_u,
                                                   jobject j_src_v,
                                                   jint src_stride_v,
@@ skipping 24 matching lines @@
   src_u += crop_x / 2 + crop_y / 2 * src_stride_u;
   src_v += crop_x / 2 + crop_y / 2 * src_stride_v;
 
   bool ret = libyuv::I420Scale(
       src_y, src_stride_y, src_u, src_stride_u, src_v, src_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);
   RTC_DCHECK_EQ(ret, 0) << "I420Scale failed";
 }
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc