Do not unnecessarily instantiate the NotificationCenter

Ignore-this: e5732efb379d7c8ac0db8c16e84acfb9

darcs-hash:20130114143425-b22ec-8a05bbff488a4546ceb721647e7b57de6268d056
Removed duplicated line

Ignore-this: 771ae70b9bef0be2f092a1b77841e39d

darcs-hash:20130115160614-56b4d-3d35a46658d6027d0bd6a3617de7cafab918f3e0