[CrOS Tether] Add disconnect handling to NetworkConnectionHandler::TetherDelegate.

chromeos/network/network_connection_handler_impl.cc

Index: chromeos/network/network_connection_handler_impl.cc
diff --git a/chromeos/network/network_connection_handler_impl.cc b/chromeos/network/network_connection_handler_impl.cc
index fb4f3201a7ffff4117570090fdef29d70afaf983..2dc84d249479a0a562891e4246298814ba09f9c5 100644
--- a/chromeos/network/network_connection_handler_impl.cc
+++ b/chromeos/network/network_connection_handler_impl.cc
@@ -241,7 +241,7 @@ void NetworkConnectionHandlerImpl::ConnectToNetwork(
                                         error_callback);
       } else {
         InvokeConnectErrorCallback(service_path, error_callback,
-                                   kErrorTetherConnectionAttemptWithNoDelegate);
+                                   kErrorTetherAttemptWithNoDelegate);
       }
       return;
     }
@@ -305,6 +305,18 @@ void NetworkConnectionHandlerImpl::DisconnectNetwork(
                                       kErrorNotConnected, "");
     return;
   }
+  if (NetworkTypePattern::Tether().MatchesType(network->type())) {
+    if (tether_delegate_) {
+      const std::string& tether_network_guid = network->guid();
+      DCHECK(!tether_network_guid.empty());
+      InitiateTetherNetworkDisconnection(tether_network_guid, success_callback,
+                                         error_callback);
+    } else {
+      InvokeConnectErrorCallback(service_path, error_callback,
+                                 kErrorTetherAttemptWithNoDelegate);
+    }
+    return;
+  }
   pending_requests_.erase(service_path);
   CallShillDisconnect(service_path, success_callback, error_callback);
 }