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

chrome/browser/chromeos/options/vpn_config_view.h

Index: chrome/browser/chromeos/options/vpn_config_view.h
diff --git a/chrome/browser/chromeos/options/vpn_config_view.h b/chrome/browser/chromeos/options/vpn_config_view.h
index 89e1c75a01d5e3e22f5381c6ff0182c585ff3f7a..39e121d5612a2d0ee8f974752ad078286d2e7640 100644
--- a/chrome/browser/chromeos/options/vpn_config_view.h
+++ b/chrome/browser/chromeos/options/vpn_config_view.h
@@ -46,9 +46,7 @@ class VPNConfigView : public ChildNetworkConfigView,
                              const views::Event& event) OVERRIDE;
 
   // views::ComboboxListener:
-  virtual void ItemChanged(views::Combobox* combo_box,
-                           int prev_index,
-                           int new_index) OVERRIDE;
+  virtual void OnSelectedIndexChanged(views::Combobox* combobox) OVERRIDE;
 
   // CertLibrary::Observer:
   virtual void OnCertificatesLoaded(bool initial_load) OVERRIDE;