Elim parent_window parameter from network_connect

ash/system/tray/default_system_tray_delegate.h

Index: ash/system/tray/default_system_tray_delegate.h
diff --git a/ash/system/tray/default_system_tray_delegate.h b/ash/system/tray/default_system_tray_delegate.h
index 5b88b01afbbfcdfd97b4e7cef681e8fdbfd8537c..359dca48213bfd282b003e8e2fcc8fad72e69160 100644
--- a/ash/system/tray/default_system_tray_delegate.h
+++ b/ash/system/tray/default_system_tray_delegate.h
@@ -65,10 +65,8 @@ class ASH_EXPORT DefaultSystemTrayDelegate : public SystemTrayDelegate {
   virtual void GetCurrentIMEProperties(IMEPropertyInfoList* list) OVERRIDE;
   virtual void SwitchIME(const std::string& ime_id) OVERRIDE;
   virtual void ActivateIMEProperty(const std::string& key) OVERRIDE;
-  virtual void ShowNetworkConfigure(const std::string& network_id,
-                                    gfx::NativeWindow parent_window) OVERRIDE;
-  virtual bool EnrollNetwork(const std::string& network_id,
-                             gfx::NativeWindow parent_window) OVERRIDE;
+  virtual void ShowNetworkConfigure(const std::string& network_id) OVERRIDE;
+  virtual bool EnrollNetwork(const std::string& network_id) OVERRIDE;
   virtual void ManageBluetoothDevices() OVERRIDE;
   virtual void ToggleBluetooth() OVERRIDE;
   virtual bool IsBluetoothDiscovering() OVERRIDE;