Use static instead of self.
Use static instead of self.

Refs #12696

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