Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.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/wrapped_native_i420_buffer.h"
 
 #include "webrtc/sdk/android/src/jni/classreferenceholder.h"
 #include "webrtc/sdk/android/src/jni/jni_helpers.h"
 
-namespace webrtc_jni {
+namespace webrtc {
+namespace jni {
 
 // TODO(magjed): Write a test for this function.
 jobject WrapI420Buffer(
     JNIEnv* jni,
-    const rtc::scoped_refptr<webrtc::I420BufferInterface>& i420_buffer) {
+    const rtc::scoped_refptr<I420BufferInterface>& i420_buffer) {
   jclass j_wrapped_native_i420_buffer_class =
       FindClass(jni, "org/webrtc/WrappedNativeI420Buffer");
   jmethodID j_wrapped_native_i420_buffer_ctor_id =
       GetMethodID(jni, j_wrapped_native_i420_buffer_class, "<init>",
                   "(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;ILjava/nio/"
                   "ByteBuffer;IJ)V");
 
   jobject y_buffer =
       jni->NewDirectByteBuffer(const_cast<uint8_t*>(i420_buffer->DataY()),
                                i420_buffer->StrideY() * i420_buffer->height());
   jobject u_buffer = jni->NewDirectByteBuffer(
       const_cast<uint8_t*>(i420_buffer->DataU()),
       i420_buffer->StrideU() * i420_buffer->ChromaHeight());
   jobject v_buffer = jni->NewDirectByteBuffer(
       const_cast<uint8_t*>(i420_buffer->DataV()),
       i420_buffer->StrideV() * i420_buffer->ChromaHeight());
 
   jobject j_wrapped_native_i420_buffer = jni->NewObject(
       j_wrapped_native_i420_buffer_class, j_wrapped_native_i420_buffer_ctor_id,
       i420_buffer->width(), i420_buffer->height(), y_buffer,
       i420_buffer->StrideY(), u_buffer, i420_buffer->StrideU(), v_buffer,
       i420_buffer->StrideV(), jlongFromPointer(i420_buffer.get()));
   CHECK_EXCEPTION(jni);
 
   return j_wrapped_native_i420_buffer;
 }
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc