Allow extension crash notifications to replace each other.

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 0d21871a71498f18d871daa1ae3a1cb05b63b93f..b359e3658eefbcba12299fb473bd42d32279cbc7 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -177,11 +177,11 @@ void NotificationImageReady(
   // TODO(mukai, dewittj): remove this and switch to message center
   // notifications.
   DesktopNotificationService::AddIconNotification(
-      GURL() /* empty origin */,
+      GURL("chrome://extension-crash"),
       base::string16(),
       message,
       notification_icon,
-      base::string16(),
+      base::UTF8ToUTF16(delegate->id()),

[Andrew T Wilson (Slow), 2014/05/19 14:02:27]

Maybe some inline comment that this is the replace_id? I just get nervous when
we have several function params, all of string type, with nothing saying what
each one is.

[dewittj, 2014/05/20 18:18:22]

Done.

       delegate.get(),
       profile);
 }