Move NotificationDelegate into message_center.

ui/message_center/fake_message_center.cc

Index: ui/message_center/fake_message_center.cc
diff --git a/ui/message_center/fake_message_center.cc b/ui/message_center/fake_message_center.cc
index a7ef9135b9bd324dd9e40529c6179e53c92d075a..b48961c4c211b043816badf9ecfb912a09f67bc9 100644
--- a/ui/message_center/fake_message_center.cc
+++ b/ui/message_center/fake_message_center.cc
@@ -62,16 +62,16 @@ void FakeMessageCenter::AddNotification(
     const string16& message,
     const string16& display_source,
     const std::string& extension_id,
-    const base::DictionaryValue* optional_fields) {
-}
+    const base::DictionaryValue* optional_fields,
+    NotificationDelegate* delegate) {}
 
 void FakeMessageCenter::UpdateNotification(
     const std::string& old_id,
     const std::string& new_id,
     const string16& title,
     const string16& message,
-    const base::DictionaryValue* optional_fields) {
-}
+    const base::DictionaryValue* optional_fields,
+    NotificationDelegate* delegate) {}
 
 void FakeMessageCenter::RemoveNotification(const std::string& id,
                                            bool by_user) {