Disabled MatChips styles differ from documentation

[amandabot]

Bug, feature request, or proposal:

MatChips with a disabled="true" attribute are given focus styles when clicked. The documentation states otherwise:

When disabled, chips are neither selectable nor focusable. Currently, disabled chips receive no special styling.

What is the expected behavior?

Disabled MatChips should not be styled per documentation

What is the current behavior?

Disabled MatChips receive focus styles when clicked

What are the steps to reproduce?

https://stackblitz.com/edit/angular-5fnwss?file=app/chips-stacked-example.html

Just click any of the chips, and it elevates with the same behavior as non-disabled chips.

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

The behavior does not match the documentation

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

Angular 5.1.0, Material 5.0.0

Is there anything else we should know?

[angular-automatic-lock-bot]

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