Remove InfoBarDelegate::InfoBarClosed(), delete InfoBars directly.

chrome/browser/tab_contents/confirm_infobar_delegate.h

Index: chrome/browser/tab_contents/confirm_infobar_delegate.h
diff --git a/chrome/browser/tab_contents/confirm_infobar_delegate.h b/chrome/browser/tab_contents/confirm_infobar_delegate.h
index 593fe3ddcc8e94830dd97d920a4f9f71a64ca329..80688cf342b7ca292d84f3c1fff7d70d36f4f4d4 100644
--- a/chrome/browser/tab_contents/confirm_infobar_delegate.h
+++ b/chrome/browser/tab_contents/confirm_infobar_delegate.h
@@ -15,6 +15,8 @@
 // control a ConfirmInfoBar.
 class ConfirmInfoBarDelegate : public InfoBarDelegate {
  public:
+  virtual ~ConfirmInfoBarDelegate();
+
   enum InfoBarButton {
     BUTTON_NONE   = 0,
     BUTTON_OK     = 1 << 0,
@@ -57,7 +59,6 @@ class ConfirmInfoBarDelegate : public InfoBarDelegate {
 
  protected:
   explicit ConfirmInfoBarDelegate(InfoBarTabHelper* infobar_helper);
-  virtual ~ConfirmInfoBarDelegate();
 
   virtual bool ShouldExpire(
       const content::LoadCommittedDetails& details) const OVERRIDE;