chromeos: Stop leaking combobox models in VPNConfigView dialog.

chrome/browser/chromeos/options/vpn_config_view.h

Index: chrome/browser/chromeos/options/vpn_config_view.h
diff --git a/chrome/browser/chromeos/options/vpn_config_view.h b/chrome/browser/chromeos/options/vpn_config_view.h
index 39e121d5612a2d0ee8f974752ad078286d2e7640..5f8c5c83b2c00484169dd8ee14a3f6bfcb361004 100644
--- a/chrome/browser/chromeos/options/vpn_config_view.h
+++ b/chrome/browser/chromeos/options/vpn_config_view.h
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "chrome/browser/chromeos/cros/cert_library.h"
 #include "chrome/browser/chromeos/options/network_config_view.h"
@@ -24,6 +25,12 @@ class Label;
 
 namespace chromeos {
 
+namespace internal {
+class ProviderTypeComboboxModel;
+class VpnServerCACertComboboxModel;
+class VpnUserCertComboboxModel;
+}
+
 // A dialog box to allow configuration of VPN connection.
 class VPNConfigView : public ChildNetworkConfigView,
                       public views::TextfieldController,
@@ -134,13 +141,17 @@ class VPNConfigView : public ChildNetworkConfigView,
   views::Textfield* server_textfield_;
   views::Label* service_text_;
   views::Textfield* service_textfield_;
+  scoped_ptr<internal::ProviderTypeComboboxModel> provider_type_combobox_model_;
   views::Combobox* provider_type_combobox_;
   views::Label* provider_type_text_label_;
   views::Label* psk_passphrase_label_;
   PassphraseTextfield* psk_passphrase_textfield_;
   views::Label* user_cert_label_;
+  scoped_ptr<internal::VpnUserCertComboboxModel> user_cert_combobox_model_;
   views::Combobox* user_cert_combobox_;
   views::Label* server_ca_cert_label_;
+  scoped_ptr<internal::VpnServerCACertComboboxModel>
+      server_ca_cert_combobox_model_;
   views::Combobox* server_ca_cert_combobox_;
   views::Textfield* username_textfield_;
   PassphraseTextfield* user_passphrase_textfield_;