Adds NetworkConnect::ConnectToNetworkId(), uses it in detailed VPN page

chromeos/network/network_connect.cc

Index: chromeos/network/network_connect.cc
diff --git a/chromeos/network/network_connect.cc b/chromeos/network/network_connect.cc
index bf6ed2ed137ece4d76d2547afd01db26862c3d47..ee0186778a13e1fd50595936d69948edba7718c6 100644
--- a/chromeos/network/network_connect.cc
+++ b/chromeos/network/network_connect.cc
@@ -26,6 +26,9 @@ namespace chromeos {
 
 namespace {
 
+void IgnoreDisconnectError(const std::string& error_name,
+                           std::unique_ptr<base::DictionaryValue> error_data) {}
+
 // Returns true for carriers that can be activated through Shill instead of
 // through a WebUI dialog.
 bool IsDirectActivatedCarrier(const std::string& carrier) {
@@ -48,6 +51,7 @@ class NetworkConnectImpl : public NetworkConnect {
 
   // NetworkConnect
   void ConnectToNetworkId(const std::string& network_id) override;
+  void DisconnectFromNetworkId(const std::string& network_id) override;
   bool MaybeShowConfigureUI(const std::string& network_id,
                             const std::string& connect_error) override;
   void SetTechnologyEnabled(const NetworkTypePattern& technology,
@@ -402,6 +406,17 @@ void NetworkConnectImpl::ConnectToNetworkId(const std::string& network_id) {
   CallConnectToNetwork(network_id, check_error_state);
 }
 
+void NetworkConnectImpl::DisconnectFromNetworkId(
+    const std::string& network_id) {
+  NET_LOG_USER("DisconnectFromNetwork", network_id);
+  const NetworkState* network = GetNetworkStateFromId(network_id);
+  if (!network)
+    return;
+  NetworkHandler::Get()->network_connection_handler()->DisconnectNetwork(
+      network->path(), base::Bind(&base::DoNothing),
+      base::Bind(&IgnoreDisconnectError));
+}
+
 bool NetworkConnectImpl::MaybeShowConfigureUI(
     const std::string& network_id,
     const std::string& connect_error) {