General cleanup of the chips view.

1) remove extra code
2) make sure we use convenience methods where possible
3) always make sure that we use sorted recipient chips when looking
for the position of a chip
4) test the convenience methods
5) rempove unused code
6) make methods package private that don't have to be public
Change-Id: I586eac795a548456ec29bd384abd2e7611a24a03