Abstract notification clicks in its own dictionary

chrome/browser/ui/cocoa/notifications/notification_builder_mac.h

Index: chrome/browser/ui/cocoa/notifications/notification_builder_mac.h
diff --git a/chrome/browser/ui/cocoa/notifications/notification_builder_mac.h b/chrome/browser/ui/cocoa/notifications/notification_builder_mac.h
index baa183311f6a0dae269b7a284160d8cb4362ef68..c9d5042b5c3d4b0651ed35e9c0d5341f88461958 100644
--- a/chrome/browser/ui/cocoa/notifications/notification_builder_mac.h
+++ b/chrome/browser/ui/cocoa/notifications/notification_builder_mac.h
@@ -11,15 +11,6 @@
 
 @class NSUserNotification;
 
-namespace notification_builder {
-
-extern NSString* const kNotificationOrigin;
-extern NSString* const kNotificationId;
-extern NSString* const kNotificationProfileId;
-extern NSString* const kNotificationIncognito;
-
-}  // notification_builder
-
 // Provides a marshallable way for storing the information required to construct
 // a NSUSerNotification that is to be displayed on the system.
 //