views: Factor out Listener from Combobox into its own header file.

ui/views/examples/text_example.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 UI_VIEWS_EXAMPLES_TEXT_EXAMPLE_H_
 #define UI_VIEWS_EXAMPLES_TEXT_EXAMPLE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/examples/example_base.h"
 #include "views/controls/button/button.h"
-#include "views/controls/combobox/combobox.h"
+#include "views/controls/combobox/combobox_listener.h"
 
 namespace views {
 class Checkbox;
 class GridLayout;
 }
 
 namespace examples {
 
 class TextExample : public ExampleBase,
                     public views::ButtonListener,
-                    public views::Combobox::Listener {
+                    public views::ComboboxListener {
  public:
   explicit TextExample(ExamplesMain* main);
   virtual ~TextExample();
 
   // Overridden from ExampleBase:
   virtual void CreateExampleView(views::View* container) OVERRIDE;
 
  private:
   // Create and add a combo box to the layout.
   views::Combobox* AddCombobox(views::GridLayout* layout,
                                const char* name,
                                const char** strings,
                                int count);
 
   // Overridden from views::ButtonListener:
   virtual void ButtonPressed(views::Button* button,
                              const views::Event& event) OVERRIDE;
 
-  // Overridden from views::Combobox::Listener:
+  // Overridden from views::ComboboxListener:
   virtual void ItemChanged(views::Combobox* combo_box,
                            int prev_index,
                            int new_index) OVERRIDE;
 
 
   class TextExampleView;
   // The content of the scroll view.
   TextExampleView* text_view_;
 
   // Combo box for horizontal text alignment.
@@ skipping 16 matching lines @@
 
   // Check box to enable/disable character break behavior.
   views::Checkbox* break_checkbox_;
 
   DISALLOW_COPY_AND_ASSIGN(TextExample);
 };
 
 }  // namespace examples
 
 #endif  // UI_VIEWS_EXAMPLES_TEXT_EXAMPLE_H_