ui/base/models: Make ComboboxModel::GetItemCount() a constant function.

chrome/browser/ui/views/cookie_info_view.h

 // Copyright (c) 2012 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_COOKIE_INFO_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_COOKIE_INFO_VIEW_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 56 matching lines @@
   virtual void ViewHierarchyChanged(bool is_add,
                                     views::View* parent,
                                     views::View* child) OVERRIDE;
 
   // views::ComboboxListener:
   virtual void ItemChanged(views::Combobox* combo_box,
                            int prev_index,
                            int new_index) OVERRIDE;
 
   // ui::ComboboxModel:
-  virtual int GetItemCount() OVERRIDE;
+  virtual int GetItemCount() const OVERRIDE;
   virtual string16 GetItemAt(int index) OVERRIDE;
 
  private:
   // Layout helper routines.
   void AddLabelRow(int layout_id, views::GridLayout* layout,
                    views::View* label, views::View* value);
   void AddControlRow(int layout_id, views::GridLayout* layout,
                      views::View* label, views::View* control);
 
   // Sets up the view layout.
@@ skipping 26 matching lines @@
   // CookiesPromptView (alert before cookie is set), in all other cases we
   // don't let user directly change cookie setting.
   bool editable_expiration_date_;
 
   CookieInfoViewDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(CookieInfoView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_COOKIE_INFO_VIEW_H_