ie: due to BadTokenException or InvalidDisplayException
Previously, only views that were already in the viewhierarchy
before attempted to be re-added would be removed. This makes
sure if the view was newly added, it'll also be removed.
This prevents a memory leak of views.
Test: manually show and cancel multiple toasts,
check the hierachy viewer that no Toast views remain
Fixes: 234694098
Change-Id: I06bbae70c277d0615753edc9ec0a8e7439ad7020
56ac2e2475