Enable users of NotificationUIManager to specify binary images.

ui/message_center/notification_types.cc

Index: ui/message_center/notification_types.cc
diff --git a/ui/message_center/notification_types.cc b/ui/message_center/notification_types.cc
index a3919878b81c1549aa556b965b377b35d54defdc..a54ed7bd3259f6dbbbff12d0aac3e98a88360a1d 100644
--- a/ui/message_center/notification_types.cc
+++ b/ui/message_center/notification_types.cc
@@ -6,10 +6,8 @@
 
 namespace message_center {
 
-const char kMessageIntentKey[] = "message_intent";
 const char kPriorityKey[] = "priority";
 const char kTimestampKey[] = "timestamp";
-const char kUnreadCountKey[] = "unread_count";
 const char kButtonOneTitleKey[] = "button_one_title";
 const char kButtonOneIconUrlKey[] = "button_one_icon_url";
 const char kButtonTwoTitleKey[] = "button_two_title";