Do not notify networkconnect if the connection type is unknown.

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

Index: talk/app/webrtc/java/jni/androidnetworkmonitor_jni.cc
diff --git a/talk/app/webrtc/java/jni/androidnetworkmonitor_jni.cc b/talk/app/webrtc/java/jni/androidnetworkmonitor_jni.cc
index 89cb010bef1c169604191740a1067fc13f1617cd..071ba45911d66e2a6ca18876a39783a171b214da 100644
--- a/talk/app/webrtc/java/jni/androidnetworkmonitor_jni.cc
+++ b/talk/app/webrtc/java/jni/androidnetworkmonitor_jni.cc
@@ -74,7 +74,7 @@ static NetworkType GetNetworkTypeFromJava(JNIEnv* jni, jobject j_network_type) {
 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;