Remove incorrect TODO and meta-data.

SHOW_INPUT_METHOD_PICKER is only used to call into
the InputMethodManagerService which as its a system
service could handle calls from the managed profile
if it desired. Howwever profiles use input methods
from the parent user that shouldn't be needed.

Bug: 20934597
Change-Id: Id5df6eb693550ff200cbc12ed66de31323689af3