Fixed proxy settings button behaviour: it becomes disabled when device isn't connected to any netwo…

ash/system/tray/system_tray_delegate.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 ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 235 matching lines @@
 
   // Toggles bluetooth.
   virtual void ToggleBluetooth() = 0;
 
   // Shows UI to connect to an unlisted wifi network.
   virtual void ShowOtherWifi() = 0;
 
   // Shows UI to search for cellular networks.
   virtual void ShowOtherCellular() = 0;
 
+  // Returns whether the system is connected to any network.
+  virtual bool IsNetworkConnected() = 0;
+
   // Returns whether wifi is available.
   virtual bool GetWifiAvailable() = 0;
 
   // Returns whether mobile networking (cellular or wimax) is available.
   virtual bool GetMobileAvailable() = 0;
 
   // Returns whether bluetooth capability is available.
   virtual bool GetBluetoothAvailable() = 0;
 
   // Returns whether wifi is enabled.
@@ skipping 18 matching lines @@
   // Opens the cellular network specific URL.
   virtual void ShowCellularURL(const std::string& url) = 0;
 
   // Shows UI for changing proxy settings.
   virtual void ChangeProxySettings() = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_