Revert "Create a new input filter to handle touch input for Software Cursor....

Revert "Create a new input filter to handle touch input for Software Cursor. Logic will be added in follow-up CLs. Software Cursor is a new accessibility feature that enables the user to control an on-screen mouse using swipes and taps on the touch screen."

This reverts commit 5d163960.

Reason for revert: Software Cursor will not launch in Android U

Change-Id: I7e97905ff5490e458209fe0bcfb0ebbcd8415fdd