clearCacheForSingleFile is not work .and How set cache mode???

[HimiGame]

usr play three website'ex: http://xxx.com/gamex.html',

i want remove one cache .so ,i use clearCacheForSingleFile, like this:

clearCacheForSingleFile('http://xxx.com/gamex.html'); ???

it's not work fine~ how i do ,pls help ~ _ ~

btw: how set cache mode in crosswalk ? tytyty