In our attempt to remove the material ripple effect from tab labels, we were
killing all `transform`-based animations on other `md-tab-group` elements, such
as animating the content when entering/leaving. (This wasn't an issue on Chrome,
because it didn't respect our `!important` flag.)
This commit fixes it by properly hiding the ripple effect (using a feature
introduced in angular/material2@e4789c7b8) and allowing other animations to
execute normally.
Fixes#17998
4d45fe6fb5