LONDON — Once (click here) among the most powerful figures in the British media, with close contacts stretching from her boss, Rupert Murdoch, to her friend, David Cameron, Rebekah Brooks, the former head of Mr. Murdoch’s British newspaper empire, was told by prosecutors on Tuesday that she, her husband and four others will face charges of conspiring to pervert the course of justice in the hacking scandal that has burrowed into public life here.