Fixes the context menu for a notification.

ui/message_center/message_center_tray_delegate.h

Index: ui/message_center/message_center_tray_delegate.h
diff --git a/ui/message_center/message_center_tray_delegate.h b/ui/message_center/message_center_tray_delegate.h
index bd5c8855d884c70157018d0ef60e5e0984b44123..d1d31ac23f07905a95adb0efc61668dbbceb2af3 100644
--- a/ui/message_center/message_center_tray_delegate.h
+++ b/ui/message_center/message_center_tray_delegate.h
@@ -37,6 +37,9 @@ class MESSAGE_CENTER_EXPORT MessageCenterTrayDelegate {
   // Display the notifier settings as a bubble.
   virtual bool ShowNotifierSettings() = 0;
 
+  // Returns true if the context menu for a notification is currently enabled.
+  virtual bool IsContextMenuEnabled() const = 0;
+
   // Show a platform-specific UI that informs the user how to open the message
   // center.
   virtual void DisplayFirstRunBalloon() {}