Only enable headers_sent() for the tests that need it.
Only enable headers_sent() for the tests that need it.

davidyell/cakephp,CakeDC/cakephp,ADmad/cakephp,ndm2/cakephp,davidyell/cakephp,dakota/cakephp,cakephp/cakephp,ndm2/cakephp,garethellis36/cakephp,ADmad/cakephp,davidyell/cakephp,mvdriel/cakephp,tenkoma/cakephp,dakota/cakephp,ndm2/cakephp,garethellis36/cakephp,cakephp/cakephp,mvdriel/cakephp,tenkoma/cakephp,tenkoma/cakephp,CakeDC/cakephp,cakephp/cakephp,petteyg/cakephp,tenkoma/cakephp,petteyg/cakephp,ndm2/cakephp,CakeDC/cakephp,garethellis36/cakephp,mvdriel/cakephp,petteyg/cakephp,ADmad/cakephp,dakota/cakephp,dakota/cakephp,CakeDC/cakephp,ADmad/cakephp,garethellis36/cakephp,cakephp/cakephp,mvdriel/cakephp,petteyg/cakephp