Add NetworkConnectionHandler class

ash/system/chromeos/network/network_state_list_detailed_view.h

Index: ash/system/chromeos/network/network_state_list_detailed_view.h
diff --git a/ash/system/chromeos/network/network_state_list_detailed_view.h b/ash/system/chromeos/network/network_state_list_detailed_view.h
index b176ddecb31d791b622521c4be5ce4c2cdf34501..9f689d6d2882006dc743a9df5cf2b6dec173b90f 100644
--- a/ash/system/chromeos/network/network_state_list_detailed_view.h
+++ b/ash/system/chromeos/network/network_state_list_detailed_view.h
@@ -110,6 +110,11 @@ class NetworkStateListDetailedView
   // Handle click (connect) action.
   void ConnectToNetwork(const std::string& service_path);
 
+  // Handle connect failures (new handlers only).
+  void OnConnectFailed(const std::string& service_path,
+                       const std::string& error_name,
+                       scoped_ptr<base::DictionaryValue> error_data);
+
   // Periodically request a network scan.
   void CallRequestScan();