Don't run dartfmt test on travis.
Don't run dartfmt test on travis.

We have different versions internally and externally, which can cause issues. Since we always run dartfmt on export to github, there's no need to verify on travis.

PiperOrigin-RevId: 165310738

chalin/angular2,chalin/angular2,angulardart/angular,chalin/angular2,matanlurey/angular,matanlurey/angular,kevmoo/angular,angulardart/angular,angulardart/angular,matanlurey/angular,kevmoo/angular,kevmoo/angular