views: Rename ComboboxListener::ItemChanged to something more accurate.

ui/views/examples/native_theme_button_example.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 "ui/views/examples/native_theme_button_example.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/stringprintf.h"
@@ skipping 73 matching lines @@
     message = is_checked_ ? "Checked! count:%d" :
       is_indeterminate_ ? "Indeterminate! count:%d" : "Unchecked! count:%d";
     break;
   default:
     DCHECK(false);
   }
 
   return base::StringPrintf(message, ++count_);
 }
 
-void ExampleNativeThemeButton::ItemChanged(Combobox* combo_box,
-                                           int prev_index,
-                                           int new_index) {
+void ExampleNativeThemeButton::OnSelectedIndexChanged(Combobox* combobox) {
   SchedulePaint();
 }
 
 gfx::NativeTheme::Part ExampleNativeThemeButton::GetThemePart() const {
   switch (cb_part_->selected_index()) {
     case 0:
       return gfx::NativeTheme::kPushButton;
     case 1:
       return gfx::NativeTheme::kRadio;
     case 2:
@@ skipping 142 matching lines @@
   layout->AddPaddingRow(0, 8);
 }
 
 void NativeThemeButtonExample::ButtonPressed(Button* sender,
                                              const Event& event) {
   PrintStatus(button_->MessWithState().c_str());
 }
 
 }  // namespace examples
 }  // namespace views