src: remove usage of extended sizeof

It's not supported in VS2013.

PR-URL: https://github.com/node-forward/node/pull/38
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

src/node_v8_platform.cc

@@ -142,7 +142,7 @@ Task* TaskQueue::Shift() {
 
 
 unsigned int TaskQueue::next(unsigned int n) {
-  return (n + 1) % ARRAY_SIZE(TaskQueue::ring_);
+  return (n + 1) % ARRAY_SIZE(TaskQueue{}.ring_);
 }