Do not enable network technology if not available

chromeos/network/network_state_handler.cc

Index: chromeos/network/network_state_handler.cc
diff --git a/chromeos/network/network_state_handler.cc b/chromeos/network/network_state_handler.cc
index aa91883ab1f970acc6a663a61eb14ce3c50e329d..8807fac3934ba697af9ca3c78d3824040dca129d 100644
--- a/chromeos/network/network_state_handler.cc
+++ b/chromeos/network/network_state_handler.cc
@@ -123,6 +123,8 @@ void NetworkStateHandler::SetTechnologyEnabled(
       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(