[material-ui] Remove remaining IE11 code

[DiegoAndai]

Material UI portion of https://github.com/mui/material-ui/issues/14420

Remove the remaining IE11-related code from the Material UI package.

[mui-bot]

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[DiegoAndai]

On hold: https://github.com/mui/material-ui/pull/42358

[DiegoAndai]

Doesn't this close https://github.com/mui/material-ui/issues/14420?

Not yet, because there are still some occurrences in other packages and the docs, as you pointed out. I want to handle those separately. This PR only covers Material UI.

[DiegoAndai]

What do you think about removing this warning? We no longer want to suggest using Material UI version 4.

@ZeeshanTamboli Good catch. I agree; we officially do not support IE, so there is no need for the warning. Implemented.

[mbrookes]

Don't forget all the uses of Array.indexOf('some string') [===|!==] -1 as a substitute for ~Array.filter~ Array.includes.

[DiegoAndai]

Don't forget all the uses of Array.indexOf('some string') [===|!==] -1 as a substitute for Array.filter.

@mbrookes, thanks for the callout. Do you remember an example in particular so we can create a separate issue for it?

[mbrookes]

Sorry, I meant Array.includes, which IE 11 doesn't support.

These should find the Material-UI specific ones but there are plenty more:

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