Chips color property not respected

[PlantPorridge]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Setting a chips color property to 'Primary', 'Accent' or 'Warn' changes the chip color based on the active theme.

What is the current behavior?

Setting a chips color property to 'Primary', 'Accent' or 'Warn' does not change the chip color.

What are the steps to reproduce?

Set the color property on a chip and observe no change.
A demo of this can be view in the Component Examples: https://material.angular.io/components/chips/examples

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

The desired behaviour is what is described by the docs.

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

Tested using what ever version is active on the Material website on Chrome Version 60.0.3112.113 (Official Build) (64-bit)

Is there anything else we should know?

[ghd8]

See #7261

[josephperrott]

Closing as fixed by #7285

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