Add HasClickedListener to the notification delegate in background_content_service.

chrome/browser/background/background_contents_service.cc

Index: chrome/browser/background/background_contents_service.cc
diff --git a/chrome/browser/background/background_contents_service.cc b/chrome/browser/background/background_contents_service.cc
index 605ae54f3b0344e362e248d30bc74afbc5d419e1..9b693d421b213f0cb1db8dfcf4996285a556cf9f 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -104,6 +104,8 @@ class CrashNotificationDelegate : public NotificationDelegate {
     ScheduleCloseBalloon(extension_id_);
   }
 
+  virtual bool HasClickedListener() OVERRIDE { return true; }

[Andrew T Wilson (Slow), 2013/05/27 12:36:50]

Please add a comment describing why this is required.

[Jun Mukai, 2013/05/27 19:10:28]

I may miss your point. Those methods are inherited from NotificationDelegate,
and I think such comments should be written in NotificationDelegate, not here.

+
   virtual std::string id() const OVERRIDE {
     return kNotificationPrefix + extension_id_;
   }