Remove the meat from the chicken and either shred finely with two forks or chop in a food processor, then put in a large bowl. Add the onion, celery, grapes and pineapple and toss to combine.
Pour this over the chicken mixture and toss well to combine.
Lay out 4 - 6 of the wraps, spread evenly with baby spinach, then scoop equal parts of the chicken mixture over the top.
Sprinkle with the corn chips, wrap up tightly, and serve.