Add WiFi SSID getter to NetworkChangeNotifier.

net/base/network_change_notifier_mac.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/network_change_notifier_mac.h"
 
 #include <netinet/in.h>
 #include <resolv.h>
 
 #include "base/basictypes.h"
@@ skipping 92 matching lines @@
 NetworkChangeNotifier::ConnectionType
 NetworkChangeNotifierMac::GetCurrentConnectionType() const {
   base::AutoLock lock(connection_type_lock_);
   // Make sure the initial connection type is set before returning.
   while (!connection_type_initialized_) {
     initial_connection_type_cv_.Wait();
   }
   return connection_type_;
 }
 
+std::string NetworkChangeNotifierMac::GetCurrentWiFiSSID() const {
+  // Not implemented. See https://crbug.com/451272
+  return "";
+}
+
 void NetworkChangeNotifierMac::Forwarder::Init()  {
   net_config_watcher_->SetInitialConnectionType();
 }
 
 void NetworkChangeNotifierMac::Forwarder::StartReachabilityNotifications() {
   net_config_watcher_->StartReachabilityNotifications();
 }
 
 void NetworkChangeNotifierMac::Forwarder::SetDynamicStoreNotificationKeys(
     SCDynamicStoreRef store)  {
@@ skipping 136 matching lines @@
     NotifyObserversOfConnectionTypeChange();
 
 #if defined(OS_IOS)
   // On iOS, the SCDynamicStore API does not exist, and we use the reachability
   // API to detect IP address changes instead.
   NotifyObserversOfIPAddressChange();
 #endif  // defined(OS_IOS)
 }
 
 }  // namespace net