ON first watch Id say no case to answer but after a few looks they may get him on this. Not because hes doing anything wrong but because of the stupid rules they insist on making to avoid any sort of racing/excitement.
As long as he goes into the hearing with the stewards and maintains that he took a wide line because he honestly believed that his car was getting away from him, so he wanted to keep as straight a line as possible. He should easily get away with it. He must stipulate that he honestly believed that if he braked hard, without going wide, he felt he might smash into safety car OR spin, thus creating an accident with the closely following Webber and Vettel.
"Guv...I had to go wide, otherwise I would've caused a massive accident."
I would stick to that story. Even if he is going down for it, stick to it. He must never admit that he was being reckless. McLaren will brief him on this anyway.