isHTMLSafe is not defined

[kylemellander]

In the touch-action.js Mixin, there is a reference to Ember.String.isHTMLSafe, which is not a valid Ember resource. This is causing the code to break when otherStyle is valid.

[juggy]

Use https://github.com/workmanw/ember-string-ishtmlsafe-polyfill. This is a 2.8/2.9 feature.