ui/base/models: Add protected virtual destructor to ComboboxModel.

ui/views/controls/combobox/native_combobox_views_unittest.cc

 // 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.
 
 #include "base/utf_string_conversions.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/base/models/combobox_model.h"
 #include "ui/views/controls/combobox/combobox.h"
 #include "ui/views/controls/combobox/native_combobox_views.h"
 #include "ui/views/ime/mock_input_method.h"
@@ skipping 117 matching lines @@
     input_method_->DispatchKeyEvent(event);
   }
 
   View* GetFocusedView() {
     return widget_->GetFocusManager()->GetFocusedView();
   }
 
   // We need widget to populate wrapper class.
   Widget* widget_;
 
-  // combobox_ will be allocated InitCombobox() and then owned by widget_.
+  // |combobox_| will be allocated InitCombobox() and then owned by |widget_|.
   TestCombobox* combobox_;
 
-  // combobox_view_ is the pointer to the pure Views interface of combobox_.
+  // |combobox_view_| is the pointer to the pure Views interface of |combobox_|.
   NativeComboboxViews* combobox_view_;
 
-  // Combobox does not take ownership of model_, which needs to be scoped.
-  scoped_ptr<ui::ComboboxModel> model_;
+  // Combobox does not take ownership of the model, hence it needs to be scoped.
+  scoped_ptr<TestComboboxModel> model_;
 
   // For testing input method related behaviors.
   MockInputMethod* input_method_;
 };
 
 TEST_F(NativeComboboxViewsTest, KeyTest) {
   InitCombobox();
   SendKeyEvent(ui::VKEY_END);
   EXPECT_EQ(combobox_->selected_item() + 1, model_->GetItemCount());
   SendKeyEvent(ui::VKEY_HOME);
@@ skipping 25 matching lines @@
   widget_->SetContentsView(container);
   container->AddChildView(combobox_);
 
   combobox_view_ = static_cast<NativeComboboxViews*>(
       combobox_->GetNativeWrapperForTesting());
   ASSERT_TRUE(combobox_view_);
   ASSERT_FALSE(combobox_view_->enabled());
 }
 
 }  // namespace views