move ngx_http_string_piece_to_pool_string out of anonymous namespace
move ngx_http_string_piece_to_pool_string out of anonymous namespace

wanrui/ngx_pagespeed,wanrui/ngx_pagespeed,digideskio/ngx_pagespeed,pagespeed/ngx_pagespeed,pagespeed/ngx_pagespeed,digideskio/ngx_pagespeed,0x0mar/ngx_pagespeed,0x0mar/ngx_pagespeed