Slider ticks doesn't go away after toggle

[ottosson]

Bug, feature request, or proposal:

Slider ticks doesn't go away after toggle

What is the expected behavior?

Slider ticks should disappear after they are toggled

What is the current behavior?

When ticks are toggled on and then off they are still visible

What are the steps to reproduce?

https://material.angular.io/components/component/slider
Under example, toggle ticks on and then off again and see that they are still visible.

What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, browsers are affected?

Material 2.0.0-beta.2, Windows 10, Chrome 56

Is there anything else we should know?

[angular-automatic-lock-bot]

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