Adds NetworkConnect::ConnectToNetworkId(), uses it in detailed VPN page

chromeos/network/network_connect.h

 // 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.
 
 #ifndef CHROMEOS_NETWORK_NETWORK_CONNECT_H_
 #define CHROMEOS_NETWORK_NETWORK_CONNECT_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 62 matching lines @@
   static void Shutdown();
 
   // Returns the global NetworkConnect object if initialized or NULL.
   static NetworkConnect* Get();
 
   virtual ~NetworkConnect();
 
   // Requests a network connection and handles any errors and notifications.
   virtual void ConnectToNetworkId(const std::string& network_id) = 0;
 
+  // Requests a network disconnection. Ignores any errors and notifications.
+  virtual void DisconnectFromNetworkId(const std::string& network_id) = 0;
+
   // Maybe show the configuration UI after a connect failure based on the
   // network state and error name. Returns true if the UI is shown.
   virtual bool MaybeShowConfigureUI(const std::string& network_id,
                                     const std::string& connect_error) = 0;
 
   // Enables or disables a network technology. If |technology| refers to
   // cellular and the device cannot be enabled due to a SIM lock, this function
   // will launch the SIM unlock dialog.
   virtual void SetTechnologyEnabled(
       const chromeos::NetworkTypePattern& technology,
@@ skipping 31 matching lines @@
  protected:
   NetworkConnect();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NetworkConnect);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_NETWORK_CONNECT_H_