Fix long press delete no response in message

It didn't repeat the delete operation when user
long press the delete button,That's the root cause
only one char was deleted.My solution of the
problem was repeating the delete operation until
user release his touch on the delete button.

Change-Id: I00f6060cdccb85bed21e344b3abc638e51cc05c2
CRs-Fixed: 1043264