chore: random test leaks

[crisbeto]

Fixes some unit tests that were leaking elements into other tests.

[jelbourn]

LGTM

Would be nice if we had something enforce that the page was pristine in-between specs, not sure how'd you do that.

[crisbeto]

AFAIK we could technically use a custom Jasmine reporter to run some logic after each test and check the DOM for leftovers (even though reporters aren't really meant to do this). I remember playing around with it for M1.

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