Type="button" automatically set by matChipRemove directive

[Guerric-P]

Reproduction

Steps to reproduce:

1. Create a new project with a <mat-chip-list><mat-chip>Some text<mat-icon matChipRemove>cancel</mat-icon></mat-chip></mat-chip-list>
2. Import bootstrap
3. Start the application

Expected Behavior

I expect the close button to display properly, and I don't expect unrelated HTML attributes on the element.

Actual Behavior

The button displays with a square around it because matChipRemove directive applies a type="button" on the host element regardless of their tag name.

This renders a <mat-icon type="button"> which has no sense nor utility, and it displays with a square around it, because of this bootstrap CSS rule:

[type=button], [type=reset], [type=submit], button {
    -webkit-appearance: button;
}

Environment

• Angular: 9
• CDK/Material: 9
• Browser(s): Chrome 79
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

Related pull request: #18095

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