Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/sdk/android/src/jni/pc/androidnetworkmonitor_jni.cc

 /*
  *  Copyright 2015 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/pc/androidnetworkmonitor_jni.h"
 
 #include <dlfcn.h>
 // This was added in Lollipop to dlfcn.h
 #define RTLD_NOLOAD 4
 
 #include "webrtc/rtc_base/bind.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/ipaddress.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 {
 
 enum AndroidSdkVersion {
   SDK_VERSION_LOLLIPOP = 21,
   SDK_VERSION_MARSHMALLOW = 23
 };
 
 int AndroidNetworkMonitor::android_sdk_int_ = 0;
 
 static NetworkType GetNetworkTypeFromJava(JNIEnv* jni, jobject j_network_type) {
   std::string enum_name =
@@ skipping 401 matching lines @@
                          JNIEnv* jni,
                          jobject j_monitor,
                          jlong j_native_monitor,
                          jlong network_handle) {
   AndroidNetworkMonitor* network_monitor =
       reinterpret_cast<AndroidNetworkMonitor*>(j_native_monitor);
   network_monitor->OnNetworkDisconnected(
       static_cast<NetworkHandle>(network_handle));
 }
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc