http: remove slow assert from hot path

Author: ronag

lib/_http_server.js

@@ -1006,7 +1006,9 @@ function resOnFinish(req, res, socket, state, server) {
   // Usually the first incoming element should be our request.  it may
   // be that in the case abortIncoming() was called that the incoming
   // array will be empty.
-  assert(state.incoming.length === 0 || state.incoming[0] === req);
+  if (state.incoming.length > 0 && state.incoming[0] !== req) {
+    throw new Error('Out of order response finish');
+  }
 
   state.incoming.shift();