PNaCl: fix memory leak on every message
PNaCl: fix memory leak on every message

Request variable was not released

beni55/furious.js,beni55/furious.js,hpcgarage/furious.js,faizanv/furious.js,amd/furious.js,hpcgarage/furious.js,faizanv/furious.js,amd/furious.js,beni55/furious.js,faizanv/furious.js,beni55/furious.js,amd/furious.js,hpcgarage/furious.js,hpcgarage/furious.js,faizanv/furious.js,amd/furious.js,amd/furious.js