Switch Blink to the new Web Notifications permission path.

Source/modules/notifications/NotificationClient.h

Index: Source/modules/notifications/NotificationClient.h
diff --git a/Source/modules/notifications/NotificationClient.h b/Source/modules/notifications/NotificationClient.h
index a45855921b27d419215c01caed3a84876b6f7e92..988faf520a56f7bcc2a1d5f13b878b46db41d0c7 100644
--- a/Source/modules/notifications/NotificationClient.h
+++ b/Source/modules/notifications/NotificationClient.h
@@ -63,11 +63,6 @@ public:
     // the notification, but must not attempt to call the event handlers.
     virtual void notificationObjectDestroyed(Notification*) = 0;
 
-    // Requests user permission to show desktop notifications from a particular
-    // script context. The callback parameter should be run when the user has
-    // made a decision.
-    virtual void requestPermission(ExecutionContext*, PassOwnPtr<NotificationPermissionCallback>) = 0;
-
     // Checks the current level of permission.
     virtual Permission checkPermission(ExecutionContext*) = 0;
 };