A man who was struck by a trolley while crossing Ala Moana Boulevard Thursday night died from his injuries Saturday afternoon.  Police said he appeared to be in his 20s. His identity has not been released yet.  The man was crossing against the light near Kamakee Street just before 11 p.m., when he was struck by the trolley traveling westbound on Ala Moana Boulevard.  Police say speed and alcohol did not appear to be factors on the part of the trolley driver, a 39-year-old Kaneohe man, who was not injured.