A few small tweaks based on further analysis of GoogleURLTracker:

chrome/browser/infobars/infobar_tab_helper.h

Index: chrome/browser/infobars/infobar_tab_helper.h
===================================================================
--- chrome/browser/infobars/infobar_tab_helper.h	(revision 134398)
+++ chrome/browser/infobars/infobar_tab_helper.h	(working copy)
@@ -64,6 +64,8 @@
   }
 
  private:
+  typedef std::vector<InfoBarDelegate*> InfoBars;
+
   void RemoveInfoBarInternal(InfoBarDelegate* delegate, bool animate);
   void RemoveAllInfoBars(bool animate);
 
@@ -72,7 +74,7 @@
   void OnDidBlockRunningInsecureContent();
 
   // Delegates for InfoBars associated with this InfoBarTabHelper.
-  std::vector<InfoBarDelegate*> infobars_;
+  InfoBars infobars_;
   bool infobars_enabled_;
 
   content::NotificationRegistrar registrar_;