Do not notify networkconnect if the connection type is unknown.

talk/app/webrtc/java/jni/androidnetworkmonitor_jni.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 56 matching lines @@
   if (enum_name == "CONNECTION_NONE") {
     return NetworkType::NETWORK_NONE;
   }
   ASSERT(false);
   return NetworkType::NETWORK_UNKNOWN;
 }
 
 static rtc::AdapterType AdapterTypeFromNetworkType(NetworkType network_type) {
   switch (network_type) {
     case NETWORK_UNKNOWN:
-      LOG(LS_WARNING) << "Unknown network type";
+      RTC_DCHECK(false) << "Unknown network type";
       return rtc::ADAPTER_TYPE_UNKNOWN;
     case NETWORK_ETHERNET:
       return rtc::ADAPTER_TYPE_ETHERNET;
     case NETWORK_WIFI:
       return rtc::ADAPTER_TYPE_WIFI;
     case NETWORK_4G:
     case NETWORK_3G:
     case NETWORK_2G:
       return rtc::ADAPTER_TYPE_CELLULAR;
     case NETWORK_BLUETOOTH:
@@ skipping 287 matching lines @@
 JOW(void, NetworkMonitor_nativeNotifyOfNetworkDisconnect)(
     JNIEnv* jni, jobject j_monitor, jlong j_native_monitor,
     jint network_handle) {
   AndroidNetworkMonitor* network_monitor =
       reinterpret_cast<AndroidNetworkMonitor*>(j_native_monitor);
   network_monitor->OnNetworkDisconnected(
       static_cast<NetworkHandle>(network_handle));
 }
 
 }  // namespace webrtc_jni