mat-chip separatorKeyCodes doesn't work if the mat-auto-complete panel is open

[achrafjdily]

Reproduction

Use StackBlitz to reproduce your issue: https://run.stackblitz.com/api/angular/v1?file=app%2Fchips-autocomplete-example.ts

Steps to reproduce:

1. try to write 'app' and tap enter or comma to add the chip
2. you can't add 'app' in this case because apple is present in the autocomplete

Expected Behavior

The autocomplete should not prevent the user from adding chips

Actual Behavior

The autocomplete prevent adding chips

Environment

• Angular:8.1.0
• CDK/Material:8.2.1
• Browser(s): chrome
• Operating System (e.g. Windows, macOS, Ubuntu): win 10

[crisbeto]

Looks like this is an issue with the example, rather than the component. Will be fixed by #17558.

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