Fixed memory leak in Password Manager UI.

chrome/browser/ui/views/passwords/credentials_selection_view.h

 // Copyright 2015 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.
 #ifndef CHROME_BROWSER_UI_VIEWS_PASSWORDS_CREDENTIALS_SELECTION_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PASSWORDS_CREDENTIALS_SELECTION_VIEW_H_
 
+#include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/autofill/core/common/password_form.h"
 #include "ui/views/view.h"
 
 namespace views {
 class Combobox;
 }
 
+namespace ui {
+class SimpleComboboxModel;
+}
+
 class ManagePasswordsBubbleModel;
 
 // A view where the user can select a credential.
 class CredentialsSelectionView : public views::View {
  public:
   explicit CredentialsSelectionView(
       ManagePasswordsBubbleModel* manage_passwords_bubble_model);
   ~CredentialsSelectionView() override;
 
   // This methods also reports a user action.
   const autofill::PasswordForm* GetSelectedCredentials();
 
  private:
-  views::Combobox* GenerateUsernameCombobox(
-      const base::string16& best_matched_username);
+  void GenerateUsernameCombobox(const base::string16& best_matched_username);
   void ReportUserActionOnce(bool was_update_rejected, int selected_index);
 
   const std::vector<autofill::PasswordForm>* password_forms_;
-  views::Combobox* combobox_;
+  std::unique_ptr<views::Combobox> combobox_;
+  std::unique_ptr<ui::SimpleComboboxModel> combobox_model_;
   int default_index_;
   bool is_default_best_match_;
   bool is_default_preferred_;
   bool action_reported_;
 
   DISALLOW_COPY_AND_ASSIGN(CredentialsSelectionView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PASSWORDS_CREDENTIALS_SELECTION_VIEW_H_