fix(mat-input): add a check for the current platform

[arturovt]

Allow AutofillMonitor.monitor and AutofillMonitor.stopMonitoring methods to be called only on the client side.

Fixes #11603

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CLAs look good, thanks!

[crisbeto]

This might be within the same scope as #11586 @josephperrott.

[josephperrott]

From reading through this change, I don't know that this is necessarily the right action to take.

The first step in the monitor method is to check the platform that is being used. So while, they will be able to be called on the server side, they amount to a noop in that situation anyway.

[crisbeto]

EDIT: nevermind, I just read through the entire conversation.

I don't think that these changes are necessary, because the autofill monitor does it internally already. See: https://github.com/angular/material2/blob/master/src/cdk/text-field/autofill.ts#L60

[ngbot]

Hi @arturovt! This PR has merge conflicts due to recent upstream merges.
Please help to unblock it by resolving these conflicts. Thanks!

[jelbourn]

@arturovt could you rebase this PR?

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