fix(material-experimental/mdc-chips): prevent ripple from escaping chip

[mmalerba]

No description provided.

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[crisbeto]

LGTM. Also it might be worth checking this in Safari. We've had issues in the past where ripples weren't clipped to rounded corners.

[devversion]

LGTM. Agreed what @crisbeto said. We had a couple of these issues (e.g. #12311)

[mmalerba]

I'm merging this as it's already been submitted in google3. Will verify Safari after

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