Add ResetModem method and call it once non_cellular activation is done.

chrome/browser/chromeos/cros/network_library_impl_cros.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 CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_CROS_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_CROS_H_
 
 #include "base/time.h"
 #include "chrome/browser/chromeos/cros/network_library_impl_base.h"
 
@@ skipping 43 matching lines @@
   virtual void ChangeRequirePin(bool require_pin,
                                 const std::string& pin) OVERRIDE;
   virtual void EnterPin(const std::string& pin) OVERRIDE;
   virtual void UnblockPin(const std::string& puk,
                           const std::string& new_pin) OVERRIDE;
   virtual void RequestCellularScan() OVERRIDE;
   virtual void RequestCellularRegister(const std::string& network_id) OVERRIDE;
   virtual void SetCellularDataRoamingAllowed(bool new_value) OVERRIDE;
   virtual void SetCarrier(const std::string& carrier,
                           const NetworkOperationCallback& completed) OVERRIDE;
+  virtual void ResetModem() OVERRIDE;
   virtual bool IsCellularAlwaysInRoaming() OVERRIDE;
   virtual void RequestNetworkScan() OVERRIDE;
 
   virtual void RefreshIPConfig(Network* network) OVERRIDE;
 
   virtual void DisconnectFromNetwork(const Network* network) OVERRIDE;
   virtual void CallEnableNetworkDeviceType(
       ConnectionType device, bool enable) OVERRIDE;
   virtual void CallRemoveNetwork(const Network* network) OVERRIDE;
 
@@ skipping 134 matching lines @@
 
   // Map of monitored devices.
   NetworkWatcherMap monitored_devices_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkLibraryImplCros);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_CROS_H_