fix:(MatChip autocomplete demo) change remove by removed property in chips-autocomplete-e…

[daguiheso]

change remove by removed for MatChip property in chips-autocomplete-example.html

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[daguiheso]

ready already form the agreement

[googlebot]

CLAs look good, thanks!

[crisbeto]

Thank you for the PR, however it'll have to be closed, because there's a pending PR that fixes the issue already: #11175.

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