Fix leftover artifacts from sliding Recents items out

When items were removed from the Recents list, the removeViewInLayout()
method was being called instead of removeView(). This avoided proper
layout and invalidation from occurring, which sometimes resulted in
detritus on the screen since the framework wasn't updating the area
last occupied by the item.

Change-Id: I43132d06df1714f00c399d34908e4d6dd0a8d5c6