Remove insertion action mode runnable on selection start

This was in a previous change and accidentally got reverted on a rebase.
When going from an Insertion to a Selection/Drag Mode we want to make
sure no insertion modes are started by pending requests.

Previous change with accidental rebase:
I91bcd0d9c3e68d9c736698fe0bec010b4c9f5cf3

Bug: 21647271
Change-Id: I32c152494d236b693a489ea97448904163c9620a