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

chrome/browser/ui/views/uninstall_view.h

 // Copyright (c) 2011 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_UNINSTALL_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_UNINSTALL_VIEW_H_
 #pragma once
 
 #include <map>
 
@@ skipping 24 matching lines @@
   // Overridden from views::DialogDelegateView:
   virtual bool Accept() OVERRIDE;
   virtual bool Cancel() OVERRIDE;
   virtual string16 GetDialogButtonLabel(ui::DialogButton button) const OVERRIDE;
 
   // Overridden from views::WidgetDelegate:
   virtual string16 GetWindowTitle() const OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
 
   // Overridden from ui::ComboboxModel:
-  virtual int GetItemCount() OVERRIDE;
+  virtual int GetItemCount() const OVERRIDE;
   virtual string16 GetItemAt(int index) OVERRIDE;
 
  private:
   // Initializes the controls on the dialog.
   void SetupControls();
 
   views::Label* confirm_label_;
   views::Checkbox* delete_profile_;
   views::Checkbox* change_default_browser_;
   views::Combobox* browsers_combo_;
   typedef std::map<std::wstring, std::wstring> BrowsersMap;
   scoped_ptr<BrowsersMap> browsers_;
   int& user_selection_;
 
   DISALLOW_COPY_AND_ASSIGN(UninstallView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_UNINSTALL_VIEW_H_