Fixed smoke test failures

- Don't try to remove window from token in WMS.postWindowRemoveCleanupLocked
since it is already removed from the token before the post remove clean-up
code is called.
- In WindowToken use removeChild when removing all windows which makes sure
the right fields are set on the child.

Bug: 31624623
Test: Manual testing and failing test now passes.
Change-Id: Ibe40b5baa49b13732b3c9876f96195d393f9f49b
3 files changed