[mdDatepickerToggle] Error in compatibility mode in v2.0.0-beta.10

[aatkin]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

mat-datepicker-toggle should render button correctly in compatibility mode.

What is the current behavior?

Error is thrown when rendering mat-datepicker-toggle:
Error: The "md-" prefix cannot be used in ng-material v1 compatibility mode. It was used on an "button" element.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 4.4.0-RC.0
Angular material 2.0.0-beta.10
Chrome 60.0.3112.113

Is there anything else we should know?

Error cause seems to be in this file: https://github.com/angular/material2/blob/master/src/lib/datepicker/datepicker-toggle.html

md-icon-button directive is included in the button element, which is forbidden in the compatibility mode (as far as I understand).

[andrewseguin]

This is due to datepicker-toggle.html using md-icon and md-icon-button. Forcing compat mode off for this component should fix that

[willshowell]

@andrewseguin @jelbourn I don't believe #7219 fixed this

Reproduction: http://plnkr.co/edit/byxfI089teHANckdiqE1?p=preview (check console)

EDIT: this seems to only be an issue with material2-builds. I see that it hasn't caught up due to CI failures. Working fine with latest release.

[jelbourn]

Closing since it should be fixed in beta.11

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