Do not enable network technology if not available

chromeos/network/network_state_handler.cc

 // 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.
 
 #include "chromeos/network/network_state_handler.h"
 
 #include "base/bind.h"
 #include "base/format_macros.h"
 #include "base/guid.h"
 #include "base/location.h"
@@ skipping 105 matching lines @@
 
 void NetworkStateHandler::SetTechnologyEnabled(
     const NetworkTypePattern& type,
     bool enabled,
     const network_handler::ErrorCallback& error_callback) {
   ScopedVector<std::string> technologies = GetTechnologiesForType(type);
   for (ScopedVector<std::string>::iterator it = technologies.begin();
       it != technologies.end(); ++it) {
     std::string* technology = *it;
     DCHECK(technology);
+    if (!shill_property_handler_->IsTechnologyAvailable(*technology))
+      continue;
     NET_LOG_USER("SetTechnologyEnabled",
                  base::StringPrintf("%s:%d", technology->c_str(), enabled));
     shill_property_handler_->SetTechnologyEnabled(
         *technology, enabled, error_callback);
   }
   // Signal Device/Technology state changed.
   NotifyDeviceListChanged();
 }
 
 const DeviceState* NetworkStateHandler::GetDeviceState(
@@ skipping 774 matching lines @@
   if (type.MatchesType(shill::kTypeBluetooth))
     technologies.push_back(new std::string(shill::kTypeBluetooth));
   if (type.MatchesType(shill::kTypeVPN))
     technologies.push_back(new std::string(shill::kTypeVPN));
 
   CHECK_GT(technologies.size(), 0ul);
   return technologies.Pass();
 }
 
 }  // namespace chromeos