Remove Notifications Associated with an Extension When the Extension is Unchecked from the Message …

ui/message_center/notifier_settings.h

Index: ui/message_center/notifier_settings.h
diff --git a/ui/message_center/notifier_settings.h b/ui/message_center/notifier_settings.h
index f1ab7f0708f23545c82b5e556635622706bbeef8..b0b11071c233fab5607d5d0e45fe5fb32a029cf3 100644
--- a/ui/message_center/notifier_settings.h
+++ b/ui/message_center/notifier_settings.h
@@ -139,6 +139,10 @@ class MESSAGE_CENTER_EXPORT NotifierSettingsObserver {
 
   // Called when any change happens to the set of notifier groups.
   virtual void NotifierGroupChanged() = 0;
+
+  // Called when a notifier is enabled or disabled.
+  virtual void NotifierEnabledChanged(const NotifierId& notifier_id,
+                                      bool enabled) = 0;
 };
 
 // A class used by NotifierSettingsView to integrate with a setting system