Add support for replace infobar. The lack of this was a top mac crasher....

chrome/browser/cocoa/infobar_container_controller.h

Index: chrome/browser/cocoa/infobar_container_controller.h
===================================================================
--- chrome/browser/cocoa/infobar_container_controller.h	(revision 24114)
+++ chrome/browser/cocoa/infobar_container_controller.h	(working copy)
@@ -64,6 +64,11 @@
 // call positionInfoBarsAndRedraw after calling this method.
 - (void)removeInfoBarsForDelegate:(InfoBarDelegate*)delegate;
 
+// Replaces all info bars for the delegate with a new info bar.
+// This simply calls removeInfoBarsForDelegate: and then addInfoBar:.
+- (void)replaceInfoBarsForDelegate:(InfoBarDelegate*)old_delegate
+                              with:(InfoBarDelegate*)new_delegate;
+
 // Positions the infobar views in the container view and notifies
 // |browser_controller_| that it needs to resize the container view.
 - (void)positionInfoBarsAndRedraw;