Stop leaking view during a11y sorting

I added a reference to a view in a pooled object,
but did not clear the reference to it when releasing it.
Thus the links to the View (and its Context) live as long
at the static object.

This code is only called when accessibility is on.

Bug: 112792715
Test: make
Change-Id: If716c33b91aac3a1da5fd4a857daa5b4b9b7e151