Clear cache after showing Sync confirmation bubble

chrome/common/chrome_notification_types.h

Index: chrome/common/chrome_notification_types.h
diff --git a/chrome/common/chrome_notification_types.h b/chrome/common/chrome_notification_types.h
index 5e96ad8452e896d9f922bea559a476b5702745a6..51b7d0390fca212a54bf132f72f2b500e034d9fa 100644
--- a/chrome/common/chrome_notification_types.h
+++ b/chrome/common/chrome_notification_types.h
@@ -312,6 +312,9 @@ enum NotificationType {
   // resource cache has to be refreshed to remove the NTP4 bubble.
   NTP4_INTRO_PREF_CHANGED,
 
+  // Notification that the NTP4 sync bubble pref has changed.
+  NTP4_SYNC_PROMO_SHOW_NTP_BUBBLE_CHANGED,
+
   // Autocomplete ------------------------------------------------------------
 
   // Sent by the autocomplete controller when done.  The source is the