refactor(material-experimental/mdc-progress-bar): update mdc-progress-bar to be compatible with API changes in MDC

[mmalerba]

Project import generated by Copybara.

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[mmalerba]

Caretaker note: this PR should not be merged until after http://cl/351815658 goes in.

After that, update to the latest MDC canary and it should be merge safe

[crisbeto]

LGTM

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