Move infobar handling to a tab helper.

chrome/browser/ui/cocoa/keystone_infobar.mm

Index: chrome/browser/ui/cocoa/keystone_infobar.mm
diff --git a/chrome/browser/ui/cocoa/keystone_infobar.mm b/chrome/browser/ui/cocoa/keystone_infobar.mm
index 81700f4d901b86375ac769c8a1e55fe9d3ba64b3..653d07a5ddeee649fe0c3892cbc72f03c721ae1e 100644
--- a/chrome/browser/ui/cocoa/keystone_infobar.mm
+++ b/chrome/browser/ui/cocoa/keystone_infobar.mm
@@ -12,6 +12,7 @@
 #include "base/message_loop.h"
 #include "base/task.h"
 #include "chrome/browser/first_run/first_run.h"
+#include "chrome/browser/infobars/infobar_tab_helper.h"
 #import "chrome/browser/mac/keystone_glue.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ -190,9 +191,9 @@ bool KeystonePromotionInfoBarDelegate::Cancel() {
 
       // Only show if no other info bars are showing, because that's how the
       // default browser info bar works.
-      if (wrapper && wrapper->infobar_count() == 0) {
-        wrapper->AddInfoBar(new KeystonePromotionInfoBarDelegate(
-            wrapper->tab_contents()));
+      if (wrapper && wrapper->infobar_tab_helper()->infobar_count() == 0) {
+        wrapper->infobar_tab_helper()->AddInfoBar(
+            new KeystonePromotionInfoBarDelegate(wrapper->tab_contents()));
       }
     }
   }