Use unbounded queue in NotificationQueue
Use unbounded queue in NotificationQueue

Summary: Use unbounded queue in NotificationQueue

Reviewed By: djwatson

Differential Revision: D7164130

fbshipit-source-id: d1b445d6730cbb2a68ad78506abe0165e28f5811

facebook/folly,facebook/folly,rklabs/folly,rklabs/folly,rklabs/folly,rklabs/folly,facebook/folly,rklabs/folly,facebook/folly,facebook/folly