Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/api/infobars/confirm_infobar_delegate.cc

Index: chrome/browser/api/infobars/confirm_infobar_delegate.cc
===================================================================
--- chrome/browser/api/infobars/confirm_infobar_delegate.cc	(revision 175396)
+++ chrome/browser/api/infobars/confirm_infobar_delegate.cc	(working copy)
@@ -8,6 +8,9 @@
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+ConfirmInfoBarDelegate::~ConfirmInfoBarDelegate() {
+}
+
 InfoBarDelegate::InfoBarAutomationType
     ConfirmInfoBarDelegate::GetInfoBarAutomationType() const {
   return CONFIRM_INFOBAR;
@@ -46,9 +49,6 @@
     : InfoBarDelegate(infobar_service) {
 }
 
-ConfirmInfoBarDelegate::~ConfirmInfoBarDelegate() {
-}
-
 bool ConfirmInfoBarDelegate::EqualsDelegate(InfoBarDelegate* delegate) const {
   ConfirmInfoBarDelegate* confirm_delegate =
       delegate->AsConfirmInfoBarDelegate();